[CBOR] Implement indefinite length writer and reader support (#33831)

[CBOR] Implement indefinite length writer and reader support (#33831)

* Implement indefinite length writes

* add indefinite-length cbor reader support

* Use CborReaderState.FormatError in Peek() instead of throwing exceptions.

* use verbose naming for indefinite-length write methods

* address feedback

* implement concatenation logic for indefinite-length string readers

* add tests for nested indefinite-length strings

* fix naming issues

* check that TryReadString() methods are idempotent on failed reads.

* use string.Create instead of char buffer; share single range list allocation

* only clear List if it is guaranteed to be reused

* move field to top of main CborReader source file.