Implement blob dataType

[acquamarin]

This is the first set of PRs to implement BLOB datatype in Kùzu.
Implements UNION functions:
BLOB(STRING) => cast a string to blob
OCTET_LENGTH(BLOB) => number of bytes in blob
DECODE(BLOB) => Convert blob to varchar. Fails if blob is not valid utf-8.
ENCODE(BLOB) => Convert varchar to blob. Converts utf-8 characters into literal encoding.

[codecov]

Codecov Report

Patch coverage: 87.02% and project coverage change: -0.01 ⚠️

Comparison is base (c6ca558) 91.17% compared to head (f4a0e82) 91.17%.

❗ Current head f4a0e82 differs from pull request most recent head 9a1da55. Consider uploading reports for the commit 9a1da55 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1690      +/-   ##
==========================================
- Coverage   91.17%   91.17%   -0.01%     
==========================================
  Files         730      735       +5     
  Lines       26662    26773     +111     
==========================================
+ Hits        24310    24409      +99     
- Misses       2352     2364      +12     

Impacted Files	Coverage Δ
src/include/common/types/types.h	100.00% <ø> (ø)
src/include/function/built_in_vector_operations.h	100.00% <ø> (ø)
src/include/function/cast/vector_cast_operations.h	91.66% <ø> (ø)
src/include/parser/transformer.h	100.00% <ø> (ø)
src/processor/operator/copy/copy_node.cpp	97.95% <ø> (ø)
src/storage/storage_structure/column.cpp	85.30% <0.00%> (-0.41%)	⬇️
...c/storage/storage_structure/disk_overflow_file.cpp	79.88% <0.00%> (-0.47%)	⬇️
src/common/types/types.cpp	88.80% <50.00%> (-0.24%)	⬇️
src/function/vector_cast_operations.cpp	82.94% <80.00%> (-0.12%)	⬇️
src/common/types/blob.cpp	83.33% <83.33%> (ø)
... and 17 more

... and 2 files with indirect coverage changes

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