chore: Reorganize the token provider

[gtema]

Apply a newer provider structure to keep modules smaller and better
structured.

[gtema]

@phiphi282 this would be a sample PR for reorganizing the provider even further. This is not completed and further token types should be split into the fernet submodule (impl of the MsgPackToken trait with the test like for application_credential)

[github-actions]

🦢 Load Test Results

Goose Attack Report

Plan Overview

Action	Started	Stopped	Elapsed	Users
Increasing	25-11-13 18:54:13	25-11-13 18:54:15	00:00:02	0 → 4
Maintaining	25-11-13 18:54:15	25-11-13 18:54:45	00:00:30	4
Decreasing	25-11-13 18:54:45	25-11-13 18:54:45	00:00:00	0 ← 4

Request Metrics

Method	Name	# Requests	# Fails	Average (ms)	Min (ms)	Max (ms)	RPS	Failures/s
GET		22226	0	4.92	3	9	740.87	0.00
	Aggregated	22226	0	4.92	3	9	740.87	0.00

Response Time Metrics

Method	Name	50%ile (ms)	60%ile (ms)	70%ile (ms)	80%ile (ms)	90%ile (ms)	95%ile (ms)	99%ile (ms)	100%ile (ms)
GET		5	5	5	5	5	5	6	9
	Aggregated	5	5	5	5	5	5	6	9

Status Code Metrics

Method	Name	Status Codes
GET		22,226 [200]
	Aggregated	22,226 [200]

Transaction Metrics

Transaction	# Times Run	# Fails	Average (ms)	Min (ms)	Max (ms)	RPS	Failures/s
ListUsers
0.0	0	0	0.00	0	0	0.00	0.00
0.1	22226	0	4.94	4	9	740.87	0.00
Aggregated	22226	0	4.92	4	9	740.87	0.00

Scenario Metrics

Transaction	# Users	# Times Run	Average (ms)	Min (ms)	Max (ms)	Scenarios/s	Iterations
ListUsers	4	22222	4.94	4	9	740.73	5555.50
Aggregated	4	22222	4.94	4	9	740.73	5555.50

Error Metrics

Method	Name	#	Error

View full report

[github-actions]

Bencher Report

Branch	provider
Testbed	ubuntu-latest

🚨 1 Alert

Benchmark	Measure Units	View	Benchmark Result (Result Δ%)	Upper Boundary (Limit %)
fernet token/project	Latency microseconds (µs)	📈 plot 🚷 threshold 🚨 alert (🔔)	1.46 µs (+26.35%) Baseline: 1.16 µs	1.37 µs (106.90%)

Click to view all benchmark results

Benchmark	Latency	Benchmark Result nanoseconds (ns) (Result Δ%)	Upper Boundary nanoseconds (ns) (Limit %)
fernet token/project	📈 view plot 🚷 view threshold 🚨 view alert (🔔)	1,460.90 ns (+26.35%) Baseline: 1,156.25 ns	1,366.60 ns (106.90%)
get_fernet_token_timestamp/project	📈 view plot 🚷 view threshold	162.68 ns (+9.39%) Baseline: 148.71 ns	189.73 ns (85.74%)

🐰 View full continuous benchmarking report in Bencher