refactor(json_deserialize): improve map_to_* API

[Conaclos]

Summary

The PR improves the API by using self as the visitor in map_to_* functions.

Test Plan

CI should pass.

[github-actions]

Parser conformance results on

js/262

Test result	main count	This PR count	Difference
Total	49701	49701	0
Passed	48642	48642	0
Failed	1059	1059	0
Panics	0	0	0
Coverage	97.87%	97.87%	0.00%

jsx/babel

Test result	main count	This PR count	Difference
Total	40	40	0
Passed	37	37	0
Failed	3	3	0
Panics	0	0	0
Coverage	92.50%	92.50%	0.00%

symbols/microsoft

Test result	main count	This PR count	Difference
Total	6322	6322	0
Passed	2036	2036	0
Failed	4286	4286	0
Panics	0	0	0
Coverage	32.20%	32.20%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	662	662	0
Passed	592	592	0
Failed	70	70	0
Panics	0	0	0
Coverage	89.43%	89.43%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	17646	17646	0
Passed	13454	13454	0
Failed	4190	4190	0
Panics	2	2	0
Coverage	76.24%	76.24%	0.00%