Add authenticated user to mdc by default

[jrhee17]

Motivation:

We use ctx.log.authenticatedUser to record the authenticated user in Central Dogma.
https://github.com/line/centraldogma/blob/54205bfcee1167f84bc1ab1a69e08fa0c3e3f2f3/server/src/main/java/com/linecorp/centraldogma/server/internal/api/auth/ApplicationTokenAuthorizer.java#L74

It would be more convenient to provide authenticatedUser as a built in property since it is already a part of the armeria core APIs anyways.

Modifications:

• Added a built in property for RequestLogProperty.AUTHENTICATED_USER

Result:

• Users can propagate authenticatedUser via mdc more conveniently

[github-actions]

🔍 Build Scan® (commit: eb4700d)

Job name	Status	Build Scan®
build-windows-latest-jdk-19	✅	https://ge.armeria.dev/s/lxbs6mw2z7pgy
build-self-hosted-unsafe-jdk-8	✅	https://ge.armeria.dev/s/mtbvqeqotinzm
build-self-hosted-unsafe-jdk-19-snapshot-blockhound	✅	https://ge.armeria.dev/s/2vaojsvhrur4i
build-self-hosted-unsafe-jdk-17-min-java-17-coverage	✅	https://ge.armeria.dev/s/sqj7p5m423fgu
build-self-hosted-unsafe-jdk-17-min-java-11	✅	https://ge.armeria.dev/s/7xppdhartsojw
build-self-hosted-unsafe-jdk-17-leak	✅	https://ge.armeria.dev/s/bl75rwkg7u5ss
build-self-hosted-unsafe-jdk-11	✅	https://ge.armeria.dev/s/eytqft56cekbw
build-macos-12-jdk-19	✅	https://ge.armeria.dev/s/2jn3rvzf43yx4

[minwoox]

Thanks! 👍 👍 👍

[thachlp]

Nit: we can use a ternary operator for consistent with others, something like this:

AUTHENTICATED_USER("authenticated.user", log -> 
    log.isAvailable(RequestLogProperty.AUTHENTICATED_USER) ? log.authenticatedUser() : null
),

[ikhoon]

It looks useful.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.02%. Comparing base (4bfa172) to head (eb4700d).
Report is 11 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5499       +/-   ##
===========================================
+ Coverage        0   74.02%   +74.02%     
- Complexity      0    20845    +20845     
===========================================
  Files           0     1807     +1807     
  Lines           0    76745    +76745     
  Branches        0     9789     +9789     
===========================================
+ Hits            0    56811    +56811     
- Misses          0    15304    +15304     
- Partials        0     4630     +4630     

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