Add support for text protocol

[HuyNguyen7994]

Continue from this #325 . Some issues so I have to recreate the repo.
Change from that PR:

• Collect all values in a single column then cast
• Try to add tests for simple primitive types

I tried setting pg_use_legacy_text_protocol=true as default and tests just failed all over the place. Issues mostly involve:

• Complex, nested data type like ARRAY, LIST, ENUM
• Non SELECT statement like DELETE. I tried and failed to handle ctid data type
• count(*) also have problems. Somehow it skips querying the ctid and just get all columns normally

At this point I just hit the wall with my C++ level. I will try to make it work with more statements, but not gonna try with any complex type. Probably better to keep those unsupported types as text but I'm torn between making this behavior implicit by default, or introducing new setting to make it explicit.

[Mytherin]

Thanks for the PR! I've picked this up and have implemented this feature now in #335