Move policy_config functions to policy_config.c

[melihmutlu]

Move policy_config_check_hypertable_lag_equality() into recently added policy_config.c file as this is a generic function to check config values.

Disable-check: force-changelog-file

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 12 lines in your changes missing coverage. Please review.

Project coverage is 82.40%. Comparing base (3a2c482) to head (7a4d2ad).

Files with missing lines	Patch %	Lines
tsl/src/bgw_policy/policy_config.c	60.00%	7 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8166      +/-   ##
==========================================
+ Coverage   82.32%   82.40%   +0.07%     
==========================================
  Files         256      256              
  Lines       47931    47903      -28     
  Branches    12077    12073       -4     
==========================================
+ Hits        39458    39473      +15     
- Misses       3637     3651      +14     
+ Partials     4836     4779      -57     

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