fix: improve debug log format

[JeyJeyGao]

Pending on #1260

Fix:

• updated timestamp to UTC with nanosecond
• added new line after request and response log

Previous example:

DEBU[2025-04-14T07:42:25Z] Request #0
> Request: "HEAD" "https://notationreg.azurecr.io/v2/hello/manifests/v1"
> Request headers:
   "Accept": "application/vnd.docker.distribution.manifest.v2+json, application/vnd.docker.distribution.manifest.list.v2+json, application/vnd.oci.image.manifest.v1+json, application/vnd.oci.image.index.v1+json, application/vnd.oci.artifact.manifest.v1+json"
   "User-Agent": "notation/v2.0.0-alpha.1+unreleased"
DEBU[2025-04-14T07:42:26Z] Response #0
< Response status: "401 Unauthorized"
< Response headers:
   "Content-Length": "199"
   "X-Content-Type-Options": "nosniff"
   "Date": "Mon, 14 Apr 2025 07:42:26 GMT"
   "Server": "AzureContainerRegistry"
   "Connection": "keep-alive"
   "Strict-Transport-Security": "max-age=31536000; includeSubDomains, max-age=31536000; includeSubDomains"
   "Content-Type": "application/json; charset=utf-8"
   "Access-Control-Expose-Headers": "Docker-Content-Digest, WWW-Authenticate, Link, X-Ms-Correlation-Request-Id"
   "Docker-Distribution-Api-Version": "registry/2.0"
   "Www-Authenticate": "Bearer realm=\"https://notationreg.azurecr.io/oauth2/token\",service=\"notationreg.azurecr.io\",scope=\"repository:hello:pull\""
   "X-Ms-Correlation-Request-Id": "df5ee6ff-0afb-47d6-ab98-6835c2e41f8a"
DEBU[2025-04-14T07:42:26Z] Request #1
> Request: "POST" "https://notationreg.azurecr.io/oauth2/token"
> Request headers:
   "Content-Type": "application/x-www-form-urlencoded"
   "User-Agent": "notation/v2.0.0-alpha.1+unreleased"

Current example:

notation sign notationreg.azurecr.io/hello:v1 -d
DEBU[2025-05-12 07:41:42.720229189Z] Request #0
> Request: "HEAD" "https://notationreg.azurecr.io/v2/hello/manifests/v1"
> Request headers:
   "Accept": "application/vnd.docker.distribution.manifest.v2+json, application/vnd.docker.distribution.manifest.list.v2+json, application/vnd.oci.image.manifest.v1+json, application/vnd.oci.image.index.v1+json, application/vnd.oci.artifact.manifest.v1+json"
   "User-Agent": "notation/v2.0.0-alpha.1+unreleased"


DEBU[2025-05-12 07:41:43.248214367Z] Response #0
< Response status: "401 Unauthorized"
< Response headers:
   "Date": "Mon, 12 May 2025 07:41:43 GMT"
   "Server": "AzureContainerRegistry"
   "Access-Control-Expose-Headers": "Docker-Content-Digest, WWW-Authenticate, Link, X-Ms-Correlation-Request-Id"
   "Docker-Distribution-Api-Version": "registry/2.0"
   "Strict-Transport-Security": "max-age=31536000; includeSubDomains, max-age=31536000; includeSubDomains"
   "X-Content-Type-Options": "nosniff"
   "X-Ms-Correlation-Request-Id": "0c11d32c-4ffe-480c-acb3-8d145a83a87e"
   "Content-Type": "application/json; charset=utf-8"
   "Content-Length": "199"
   "Connection": "keep-alive"
   "Www-Authenticate": "Bearer realm=\"https://notationreg.azurecr.io/oauth2/token\",service=\"notationreg.azurecr.io\",scope=\"repository:hello:pull\""


DEBU[2025-05-12 07:41:43.248394566Z] Request #1
> Request: "POST" "https://notationreg.azurecr.io/oauth2/token"
> Request headers:
   "Content-Type": "application/x-www-form-urlencoded"
   "User-Agent": "notation/v2.0.0-alpha.1+unreleased"


DEBU[2025-05-12 07:41:43.414852708Z] Response #1
< Response status: "200 OK"
< Response headers:
   "Connection": "keep-alive"
   "X-Ms-Correlation-Request-Id": "d4baeae0-e47e-4b6f-8767-a7002229a1d6"
   "X-Ms-Ratelimit-Remaining-Calls-Per-Second": "333.316667"
   "Strict-Transport-Security": "max-age=31536000; includeSubDomains"
   "Server": "AzureContainerRegistry"
   "Date": "Mon, 12 May 2025 07:41:43 GMT"
   "Content-Type": "application/json; charset=utf-8"

Color:

Resolve part of #1247

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.01%. Comparing base (c68425f) to head (eb8f9e7).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1248      +/-   ##
==========================================
+ Coverage   76.96%   77.01%   +0.04%     
==========================================
  Files          68       68              
  Lines        3847     3855       +8     
==========================================
+ Hits         2961     2969       +8     
  Misses        682      682              
  Partials      204      204              

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[ghost]

LGTM

[FeynmanZhou]

LGTM. Thanks @JeyJeyGao

[shizhMSFT]

LGTM