InSC-InPC-gc invariant test

[eggrobin]

See UTC-177-C41 and UTC-177-C42. Fix #526.

[177-A95] Action Item for Robin Leroy, PAG: For U+1171E AHOM CONSONANT SIGN MEDIAL RA, change the gc property value from Mn to Mc and Bidi_Class value from NSM to L for Unicode version 16.0. (Ref. Section 17 of L2/23-238)

Fails as expected before the property changes:

\p{InPC=/(Left|Right)/} ⊆ [\p{gc=Mc}\p{gc=Lo}]

**** START Test Failure 1 ****
## Expected empty, got: 3 [\u0D41\u0D42\U0001171E]

## In \p{InPC=/(Left|Right)/}

## But Not In [\p{gc=Mc}\p{gc=Lo}]

0D41..0D42	#	[2]	(ു..ൂ)	MALAYALAM VOWEL SIGN U..MALAYALAM VOWEL SIGN UU
1171E	#		(𑜞)	AHOM CONSONANT SIGN MEDIAL RA
**** END Test Failure 1 ****

[\P{InPC=NA}&\p{gc=Mc}] ⊆ \p{InPC=/(Left|Right)/}

[\P{InPC=NA}&\P{InPC=/(Left|Right)/}] ⊆ [\p{gc=Mn}\p{gc=Lo}]

\p{gc=Mn} ⊆ \P{InPC=/(Left|Right)/}

**** START Test Failure 2 ****
## Expected empty, got: 3 [\u0D41\u0D42\U0001171E]

## In \p{gc=Mn}

## But Not In \P{InPC=/(Left|Right)/}

0D41..0D42	#	[2]	(ു..ൂ)	MALAYALAM VOWEL SIGN U..MALAYALAM VOWEL SIGN UU
1171E	#		(𑜞)	AHOM CONSONANT SIGN MEDIAL RA
**** END Test Failure 2 ****

[\p{gc=Lo}&\P{InPC=NA}&\P{InPC=/(Left|Right)/}] ⊆ [\p{InSC=Consonant_Preceding_Repha}\p{InSC=Consonant_Prefixed}]