feat: apply `to_tsvector` to the filtered columns when a `fts` operator is used #779

Loadtest Results

param	v12.2.3	head	main
bytes_in.mean	984	983	983
bytes_in.total	25205795	23794866	22527896
bytes_out.mean	3848	3848	3848
bytes_out.total	98598215	93137000	88183805
duration	60007314182	60014730244	60001846900
latencies.50th	1034981	983039	1035147
latencies.90th	2199473	2028104	2183463
latencies.95th	15230920	17172607	18196979
latencies.99th	15565156	17833252	18545821
latencies.max	30583741	27505773	37818422
latencies.mean	2339843	2478695	2617242
latencies.min	163465	164818	169977
latencies.total	59949125964	59989389934	59974118175
rate	427	403	382
requests	25621	24202	22915
status_codes.200	13976	13202	12500
status_codes.201	4658	4400	4166
status_codes.204	6987	6600	6249
success	1	1	1
throughput	427	403	382
wait	1058827	867006	1064057