Add geohash support for PGWire protocol

[eugenels]

No description provided.

[marregui]

LGTM

I would add a few more tests though, around the areas of:

• geohashes containing wrong characters e.g. '@'
• table column declared with a precision, then the insert containing a LOWER precision geohash -> should reject
• table column declared with a precision, then the insert containing a HIGHER precision geohash -> should truncate
• something that looks like a geohash but it is not, e.g. londer than 60 bits or 12 chars

[marregui]

LGTM

Personal opinion, I would merge and then add the missing todo part as a different task.
There is a PR in transit at the moment that could be merged and which contains literal syntax for geohash constants.

[ideoma]

[PR Coverage check]

😍 pass : 46 / 47 (97.87%)

file detail

	path	covered line	new line	coverage
🔵	io/questdb/cutlass/pgwire/PGConnectionContext.java	45	46	97.83%
🔵	io/questdb/cutlass/pgwire/PGOids.java	1	1	100.00%