PG-2029 Experimental Meson support

[jeltz]

This is a proof of concept for adding support for Meson, including support for running TAP tests.

TODO

• Add support for pg_regress tests
• Figure out what to do with the compiler flags. Should we respect the values we get from pg_config?
• Fix Meson support on MacOS
• Investigate test failures on MacOS
• Fix sanitizers
• Fix coverage
• Fix code formatting
• Clean up CI code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.53%. Comparing base (0d5f61d) to head (18b8e7e).
⚠️ Report is 2 commits behind head on main.

❌ Your project status has failed because the head coverage (74.44%) is below the target coverage (90.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@ Coverage Diff @@ ## main #531 +/- ## ========================================== - Coverage 58.63% 56.53% -2.11%  ========================================== Files 68 67 -1 Lines 10696 10806 +110 Branches 1842 2787 +945 ========================================== - Hits 6272 6109 -163  + Misses 3557 3276 -281  - Partials 867 1421 +554 

Components	Coverage Δ
access	77.31% <ø> (-3.46%)	⬇️
bin	64.97% <ø> (-4.86%)	⬇️
catalog	76.02% <ø> (-8.61%)	⬇️
common	83.33% <ø> (+11.11%)	⬆️
encryption	48.59% <ø> (-10.24%)	⬇️
keyring	64.31% <ø> (-3.50%)	⬇️
src	86.61% <ø> (-3.44%)	⬇️
smgr	89.23% <ø> (-2.09%)	⬇️

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