ICU-23144 Prevent exponential parsing time in RBNF. Sync ICU4C and ICU4J RBNF. Fix roundtrip parsing of rules that use 2 of the same substitution type. Fix bad parsing of rules with delimiters that can be a part of a number.

ICU-23144 Prevent exponential parsing time in RBNF. Sync ICU4C and ICU4J RBNF. Fix roundtrip parsing of rules that use 2 of the same substitution type. Fix bad parsing of rules with delimiters that can be a part of a number. #146