[move][move-compiler] Add modes to compiler

[cgswords]

Description

This adds modes to the compiler. Note this does not currently poison non-test modes, but it is possible we should before landing it.

Test plan

New tests, plus existing ones.

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Release notes

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• [ ] Protocol:
• [ ] Nodes (Validators and Full nodes):
• [ ] gRPC:
• [ ] JSON-RPC:
• [ ] GraphQL:
• [ ] CLI:
• [ ] Rust SDK:

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[cgswords]

I think I got everything. I had initially just done testing through the move CLI, but stopped and wrote a harness for testing in the compiler now, too.