feat(c): Add pkgconfig support to Meson build system #694

Job	Run time
check (ubuntu, adbcdrivermanager) / r-check	2m 12s
check (ubuntu, adbcflightsql) / r-check	3m 20s
check (ubuntu, adbcpostgresql) / r-check	2m 11s
check (ubuntu, adbcsnowflake) / r-check	2m 37s
check (ubuntu, adbcsqlite) / r-check	2m 29s
	12m 49s

Provide feedback