Bug fix for dolt_ tables with incompatible types

[zachmu]

Fixes #1405

This works by placing a typecast on unconverted dolt_ table fields so that they work in any expression that requires a doltgresType.

[github-actions]

	Main	PR
covering_index_scan_postgres	348.96/s	346.44/s	-0.8%
index_join_postgres	154.34/s	155.43/s	+0.7%
index_join_scan_postgres	186.21/s	185.83/s	-0.3%
index_scan_postgres	12.64/s	12.58/s	-0.5%
oltp_point_select	2610.87/s	2587.67/s	-0.9%
oltp_read_only	1842.61/s	1833.24/s	-0.6%
select_random_points	117.30/s	117.29/s	-0.1%
select_random_ranges	128.58/s	127.49/s	-0.9%
table_scan_postgres	11.95/s	11.84/s	-1.0%
types_table_scan_postgres	5.52/s	5.63/s	+1.9%

[github-actions]

	Main	PR
Total	42090	42090
Successful	16361	16361
Failures	25729	25729
Partial Successes1	5530	5530

	Main	PR
Successful	38.8715%	38.8715%
Failures	61.1285%	61.1285%

Footnotes

1. These are tests that we're marking as Successful, however they do not match the expected output in some way. This is due to small differences, such as different wording on the error messages, or the column names being incorrect while the data itself is correct. ↩

[Hydrocharged]

LGTM!