[WIP]feature:[loom] replace the usages of synchronized with ReentrantLock #7073
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Ⅰ. Describe what this PR did
To use virtual threads in JDK 21, we need to remove the usage of synchronized to prevent the issue where "a virtual thread cannot be unmounted during blocking operations because it is pinned to its carrier."
Ⅱ. Does this pull request fix one issue?
fixes #6971
Ⅲ. Why don't you add test cases (unit test/integration test)?
Ⅳ. Describe how to verify it
Ⅴ. Special notes for reviews