Push Model: Perform attestation (quote, uefi and ima logs)

[sarroutbi]

This PR enhances the push-model agent by adding the complete logic for IMA and UEFI log collection and submission, making the attestation process asynchronous, and refactoring the agent's main loop for clarity and robustness.

Key Changes:

• Full IMA and UEFI Log Collection:
  The agent now properly handles requests for IMA and UEFI event logs.

• Asynchronous Attestation:
  The entire evidence creation process is now asynchronous to prevent blocking.

• Code Refactoring and Cleanup:
  Added the core perform_attestation function to ContextInfo, centralizing the logic for creating attestation evidence.
  The main agent binary's logic has been significantly refactored. The main.rs file now orchestrates the high-level flow, while the specifics of sending HTTP requests and handling responses have been moved into a dedicated attestation.rs module.

[codecov]

Codecov Report

Attention: Patch coverage is 48.81141% with 323 lines in your changes missing coverage. Please review.

Project coverage is 58.46%. Comparing base (9654555) to head (1448822).
Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
keylime-push-model-agent/src/attestation.rs	22.14%	109 Missing ⚠️
keylime/src/context_info.rs	51.51%	48 Missing ⚠️
keylime-push-model-agent/src/main.rs	45.20%	40 Missing ⚠️
keylime-push-model-agent/src/response_handler.rs	42.62%	35 Missing ⚠️
...ylime-push-model-agent/src/context_info_handler.rs	49.12%	29 Missing ⚠️
keylime-push-model-agent/src/struct_filler.rs	52.77%	17 Missing ⚠️
keylime/src/tpm.rs	64.58%	17 Missing ⚠️
keylime/src/ima/ima_log.rs	42.85%	16 Missing ⚠️
keylime/src/uefi/uefi_log_handler.rs	88.40%	8 Missing ⚠️
keylime-push-model-agent/src/url_selector.rs	83.33%	2 Missing ⚠️
... and 1 more

Additional details and impacted files

Flag	Coverage Δ
e2e-testsuite	58.46% <48.81%> (-1.03%)	⬇️
upstream-unit-tests	58.46% <48.81%> (-1.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
keylime/src/ima/entry.rs	76.69% <100.00%> (+0.50%)	⬆️
keylime/src/structures/capabilities_negotiation.rs	75.00% <ø> (ø)
keylime-push-model-agent/src/url_selector.rs	66.66% <83.33%> (-3.47%)	⬇️
keylime/src/structures/evidence_handling.rs	64.19% <33.33%> (-1.63%)	⬇️
keylime/src/uefi/uefi_log_handler.rs	81.65% <88.40%> (+3.79%)	⬆️
keylime/src/ima/ima_log.rs	44.00% <42.85%> (-1.46%)	⬇️
keylime-push-model-agent/src/struct_filler.rs	21.75% <52.77%> (-5.35%)	⬇️
keylime/src/tpm.rs	68.26% <64.58%> (-0.08%)	⬇️
...ylime-push-model-agent/src/context_info_handler.rs	49.12% <49.12%> (ø)
keylime-push-model-agent/src/response_handler.rs	42.62% <42.62%> (ø)
... and 3 more

... and 6 files with indirect coverage changes

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[sarroutbi]

@ansasaki , @sergio-correia : Please, don't pay attention to coverage. Locally, files such as handle_response.rs are covered at 100% (checked with Tarpaulin):

[ansasaki]

@sarroutbi I see from the test results that we need to merge #1042 before this one.

EDIT: It seems it won't be necessary. I'll merge this and rebase the other

[sarroutbi]

@sarroutbi I see from the test results that we need to merge #1042 before this one.

EDIT: It seems it won't be necessary. I'll merge this and rebase the other

Cool. Thank you so much for your help with the rebase.