[opt](file_cache) Add config to enable base compaction output to file cache (#44497)

[gavinchou]

Previous implementation does not allow the output of base compaction write into file cache, which may have some performance penalty.

This commit add a config to make that policy configurable. be.conf enable_file_cache_keep_base_compaction_output it is false by default.

If your file cache is ample enough to accommodate all the data in your database, enable this option; otherwise, it is recommended to leave it disabled.

master branch PR #44497

[doris-robot]

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1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
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[gavinchou]

run buildall

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[dataroaring]

LGTM