fix: derive record merge strategy based on table configs

[xushiyan]

Description

• Derive hoodie.table.record.merge.strategy based on hoodie.populate.meta.fields and hoodie.table.precombine.field
• Remove hard-coded default value
• Add test cases for table with populate meta fields = false

How are the changes test-covered

• N/A
• Automated tests (unit and/or integration tests)
• Manual tests
  • Details are described below

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.20%. Comparing base (3527f54) to head (39d641b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #260      +/-   ##
==========================================
+ Coverage   91.13%   91.20%   +0.06%     
==========================================
  Files          40       40              
  Lines        1952     1967      +15     
==========================================
+ Hits         1779     1794      +15     
  Misses        173      173              

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