[improve] PIP-467: Convert pulsar-common module logging from SLF4J to slog

[merlimat]

Summary

• Convert all 42 source and test files in pulsar-common from SLF4J to slog structured logging
• Replace @Slf4j with @CustomLog and convert log statements to slog fluent API with structured attributes
• Use .exception(e) for Throwable objects and lazy attrs where appropriate
• Remove Logger parameter from internal FileUtils methods (use class-level logger instead)

Test plan

• compileJava and compileTestJava pass
• checkstyleMain and checkstyleTest pass
• CI passes

Motivation

PIP-467

Modifications

Convert pulsar-common module from SLF4J to slog structured logging.

Note

Please label this PR with ready-to-test

[lhotari]

btw. Should we also add the .git-blame-ignore-revs file for the large refactorings? It would have to be added after merging to master branch since the commit hash gets created at that point.
Locally it would require git config blame.ignoreRevsFile .git-blame-ignore-revs.
GitHub supports it by default: docs, announcement

[lhotari]

LGTM

[merlimat]

btw. Should we also add the .git-blame-ignore-revs file for the large refactorings? It would have to be added after merging to master branch since the commit hash gets created at that point.

For as pure formatting change sure, though here there could potentially be bugs deriving from this commit, so it might be good to not hide them.