Add new theorems related to restricted class abstraction, mappings, and measurable functions #8610

Job	Run time
Check for duplicate jobs to avoid duplication	7s
Verify using checkmm (a C++ verifier by Eric Schmidt)	27s
Verify using smetamath-rs (smm3) (Rust verifier by Stefan O'Rear)	9s
Check dates in set.mm	21s
Verify using metamath.exe (original C verifier by Norman Megill)	48s
Verify using metamath-knife	10s
Verify using mmj2 (Java verifier by Mel L. O'Cat and Mario Carneiro)	59s
Verify iset.mm using mmverify.py (Python verifier by Raph Levien)	12s
Verify set.mm using mmverify.py (Python verifier by Raph Levien)	38s
Generate TeX output using metamath.exe	2m 37s
	6m 28s

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