Refactor: Cache SQL Statements, Move Migrations Into Folder Structure, Fix Testfolder Teardown, Remove Unneeded Override Of TypeScript Dependency

[WyvernIXTL]

Added:

• SQL statements are cached.
  As there aren't any performance tests currently, it is hard to say what performance benefits there are.

Fixed:

• Tear down of temporary directories in sqlite storage backend tests fixed.

Changed:

• SQL Migrations are now a file structure.

Fixed:

• Warning regarding dead code of iv_len function.

Removed:

Checklist:

• Do the unit tests in CAL run? Check at least those that you can run: cargo test -F software
• Are changes in common propagated to all providers that are currently in use?
  • software
  • tpm/android
  • tpm/apple_secure_enclave
• Did changes in the API occur, such that ./ts-types needs to be updated?
  • Generate types partially.
  • Have you given the maintainer of crypto-layer-node a heads up?
• Do the dart bindings have to be re-generated?
• Does the flutter plugin still compile?
• Do the integration tests in flutter-app still run?
• There are no build artifacts in the commit. (node_modules, lib, target and everything in .gitignore)