crucible-wasm: Support instructions added in Wasm 2.0

[RyanGlScott]

#1232 allows crucible-wasm to compile with a version of the Haskell wasm library that supports Wasm 2.0. However, crucible-wasm does not yet support all of the new instructions that debuted in Wasm 2.0. This issue is a reminder to add support for the following instructions:

• ref.null, ref.is_null, and ref.func (see SPY/haskell-wasm@51cf7e7)
• table.init, table.grow, table.size, table.fill, table.get, table.set, and table.copy (see SPY/haskell-wasm@4753ebc)
• elem.drop (see SPY/haskell-wasm@82defff)
• memory.fill, memory.copy, memory.init, and data.drop (see SPY/haskell-wasm@2bf6e88)

It is likely that some of these instructions will require robust support for Wasm 2.0's reference types and values (see #1128) in order to work properly.