Upstream WebAssembly specific features from Kasmer

We should pull any features taht are WebAssembly specific into this repository. In particular:

• A new class KWasm which contains any KLabel and helpers for constructing KWasm terms (similar to KEVM class: https://github.com/runtimeverification/evm-semantics/blob/71a19f1a085efd1cf2987954101f500b7c02a6ce/kevm-pyk/src/kevm_pyk/kevm.py#L394).
• A new class called KWasmSemantics which implements semantics specific heuristics (can use DefaultSemantics as the initial implementations) (KEVM example: https://github.com/runtimeverification/evm-semantics/blob/71a19f1a085efd1cf2987954101f500b7c02a6ce/kevm-pyk/src/kevm_pyk/kevm.py#L53). Should contain:
  • is_terminal predicate for identifying states that should not be executed past (eg. for checking "should we check subsumption for this state or not).
  • abstract_node operator for abstracting away parts of the KWasm state.
• Any core body of lemmas that are useful for WebAssembly in general:
  • The lemmas can be migrated upstream to WebAssembly.
  • The tests can be minimized and migrated upstream to WebAssembly (simplification tests, I assume).

Then retool Kasmer to use these classes and delete the code downstream.