Cell fmt parade

[kysshsy]

This pr:

1. Fix bug in Cell type Bytea fmt function.
   1.1 Missing single quotes around the string \xABCD -> '\xABCD' (...)
   1.2 if bytes len is 0, it should be '' . '\x' -> ''.
2. I found a bug before. It's because the different representation of hex in postgres and duckdb.
   duckdb hex: '\xAB\xCD'
   postgres hex: '\xABCD'
   It's not compatible. So ...I think it should implement postgres style in Wrapper repo. Duckdb style should be a user-defined function. And I implement trait CellFormatter allow to do that.
   This implementation is better than implementing the DuckDB pattern and more conducive to upstream.
   raise a PR : feat: Add user-defined cell fmt interface supabase/wrappers#316

[philippemnoel]

This pr:

1. Fix bug in Cell type Bytea fmt function.
   1.1 Missing single quotes around the string \xABCD -> '\xABCD' (...)
   1.2 if bytes len is 0, it should be '' . '\x' -> ''.
2. I found a bug before. It's because the different representation of hex in postgres and duckdb.
   duckdb hex: '\xAB\xCD'
   postgres hex: '\xABCD'
   It's not compatible. So ...I think it should implement postgres style in Wrapper repo. Duckdb style should be a user-defined function. And I implement trait CellFormatter allow to do that.
   This implementation is better than implementing the DuckDB pattern and more conducive to upstream.
   raise a PR : feat: Add user-defined cell fmt interface supabase/wrappers#316

Thank you for making this! We really should PR this repository upstream and just start using upstream...