[API] spec: struct tag regex supports multiple type parameters
[API] spec: struct tag regex supports multiple type parameters

For example Table<T1, T2> can be part of the tag

Closes: #524

aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core