Update begin trasaction syntax

[ray6080]

BEGIN READ TRANSACTION -> BEGIN TRANSACTION READ ONLY
BEGIN WRITE TRANSACTION -> BEGIN TRANSACTION

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (850f506) 89.62% compared to head (353ecef) 89.65%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2126      +/-   ##
==========================================
+ Coverage   89.62%   89.65%   +0.02%     
==========================================
  Files         988      988              
  Lines       35653    35653              
==========================================
+ Hits        31954    31963       +9     
+ Misses       3699     3690       -9     

Files	Coverage Δ
src/main/connection.cpp	92.53% <100.00%> (ø)
src/parser/transform/transform_transaction.cpp	87.50% <100.00%> (ø)

... and 1 file with indirect coverage changes

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