Replace AccessMode in API with boolean flag read_only

[ray6080]

Exposing customized num in API is not user-friendly. Instead, native boolean flag is easier to use from users' perspective. Thus, this PR proposes to change AccessMode accessMode to bool readOnly in various language bindings in similar fashion.

TODO:

• Update our API doc on access mode.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cc7f6ac) 90.99% compared to head (4036b64) 90.94%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2357      +/-   ##
==========================================
- Coverage   90.99%   90.94%   -0.05%     
==========================================
  Files        1012     1012              
  Lines       35895    35897       +2     
==========================================
- Hits        32661    32647      -14     
- Misses       3234     3250      +16     

Files	Coverage Δ
src/c_api/database.cpp	85.00% <100.00%> (ø)
src/include/storage/index/hash_index.h	95.55% <100.00%> (ø)
src/include/storage/storage_manager.h	100.00% <ø> (ø)
...ude/storage/storage_structure/disk_overflow_file.h	87.50% <ø> (ø)
src/include/storage/store/column.h	84.21% <ø> (ø)
src/include/storage/store/node_table.h	100.00% <ø> (ø)
src/include/storage/wal/wal.h	100.00% <ø> (ø)
src/main/connection.cpp	90.44% <100.00%> (-0.13%)	⬇️
src/main/database.cpp	100.00% <100.00%> (ø)
src/storage/index/hash_index.cpp	96.89% <100.00%> (-0.03%)	⬇️
... and 11 more

... and 3 files with indirect coverage changes

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[mewim]

API changes LGTM