fix(schema): make optional the options JSON schema field

[Conaclos]

Fix #4070

[github-actions]

Parser conformance results on

js/262

Test result	main count	This PR count	Difference
Total	48534	48534	0
Passed	47341	47341	0
Failed	1193	1193	0
Panics	0	0	0
Coverage	97.54%	97.54%	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	6570	6570	0
Passed	2204	2204	0
Failed	4366	4366	0
Panics	0	0	0
Coverage	33.55%	33.55%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	680	680	0
Passed	608	608	0
Failed	72	72	0
Panics	0	0	0
Coverage	89.41%	89.41%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	18438	18438	0
Passed	14117	14117	0
Failed	4321	4321	0
Panics	0	0	0
Coverage	76.56%	76.56%	0.00%