log cache evict

[xixi2]

What type of PR is this?

Features

What this PR does / why we need it:

add page cache eviction for log files
we do this by call fadvise to tell kernel we don't expect access in the near future.

Which issue(s) this PR fixes:

Special notes for your reviewer:

[codecov]

Codecov Report

Attention: Patch coverage is 53.65854% with 76 lines in your changes missing coverage. Please review.

Project coverage is 56.94%. Comparing base (f423d5b) to head (ae35f7a).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...nt/qrm-plugins/memory/handlers/logcache/manager.go	67.81%	16 Missing and 12 partials ⚠️
...ns/memory/handlers/logcache/cache_evictor_linux.go	32.43%	23 Missing and 2 partials ⚠️
...md/katalyst-agent/app/options/qrm/memory_plugin.go	53.33%	14 Missing ⚠️
...g/agent/qrm-plugins/memory/dynamicpolicy/policy.go	10.00%	8 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #689      +/-   ##
==========================================
- Coverage   56.99%   56.94%   -0.06%     
==========================================
  Files         566      568       +2     
  Lines       54500    54664     +164     
==========================================
+ Hits        31061    31127      +66     
- Misses      19553    19637      +84     
- Partials     3886     3900      +14     

Flag	Coverage Δ
unittest	56.94% <53.65%> (-0.06%)	⬇️

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