feat!: type coercions for Terraform

[brandonspark]

What:

This PR adds in coercions from literals of bools, ints, and floats to strings, in the matching engine.

Why:

This is how Terraform works, and it was requested by a user: #6898

How:

I added a wrapper for m_literal, which first checks if the language is hcl. If so, then it does the coercions on the necessary cases. Otherwise, it will defer to the original m_literal, now named m_literal_inner.

Test plan:

make test

Closes #6898

PR checklist:

• Purpose of the code is evident to future readers
• Tests included or PR comment includes a reproducible test plan
• Documentation is up-to-date
• A changelog entry was added to changelog.d for any user-facing change
• Change has no security implications (otherwise, ping security team)

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