R2RDump - Runtime function RVAs and method signatures (#17994)

R2RDump - Runtime function RVAs and method signatures (#17994)

* R2RDump - Runtime function RVAs and sizes

* Change hard error to warning, GetInt64,32,16 helper functions

* Method signatures from metadata, GetUnsigned functions, arbitrary sections for GetOffset

* Use methodDefEntryPoints to match method metadata to native code, make runtime function endAddress conditional on machine type

* Get object arg and return types of method signature from TypeDef, use ReadUInt

* Iterate all rids, added NativeArray class

* Handle multiple runtime functions in a method, use ReadByte, make rid unsigned

* Use MethodDefinitionHandle(rid) instead of dictionary, make ReadByte signature similar to other Read methods

* Changes to getting runtime functions, increment the start index in ReadByte, added comments

* Use List for R2RMethods instead of array, fixed nits