[Function-NoOp] Implement Hashing function backends

[TheIronDev]

Description

Implement generating a hash of function backends.

This functionality is not wired up to anything (yet).

Scenarios Tested

• [x] Files matching
• [x] Files not matching
• [x] Secret versions matching
• [x] Secret versions not matching
• [x] Env variables matching
• [x] Env variables not matching