Improve logger for token server

[t4niwa]

Description

• Add INFO level logging for requests and responses between clients and the token provider
• Remove duplicate starting health check log

Example

Request log

INFO[2024-02-28T12:10:44+09:00] Received request: method[POST], endpoint[/roletoken], remoteAddr[127.0.0.1:57279] requestID[4d9bc78f-899c-435d-9505-2e3573427311] 

Response log

INFO[2024-02-28T12:10:44+09:00] Response sent: statusCode[200], latency[80.661167ms], requestID[4d9bc78f-899c-435d-9505-2e3573427311]

Type of change

• [ ] Bug fix
• [x] New feature
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Non-code changes (update documentation, pipeline, etc.)

Flags

• [ ] Breaks backward compatibility
• [ ] Requires a documentation update
• [ ] Has untestable code

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Checklist

• [x] Followed the guidelines in the CONTRIBUTING document
• [x] Added prefix [skip ci]/[ci skip]/[no ci]/[skip actions]/[actions skip] in the PR title if necessary
• [x] Tested and linted the code
• [x] Commented the code
• [x] Made corresponding changes to the documentation
• [x] Passed all pipeline checking

Checklist for maintainer

• Use Squash and merge
• Double-confirm the merge message has prefix [skip ci]/[ci skip]/[no ci]/[skip actions]/[actions skip]
• Delete the branch after merge