Unit tests, Ci and refractor. (planning#361)

See merge request !10

Refractoring. removed duplicated code. Keystore password is now read from environment variable and only if this is not set a manual input is required. Changed tests accordingly. Removed old comments. Tests now use tempdir. Removed monkeypatch usage.

Added unit tests. Added script that generates a ca with openssl. Renamed pkcs12ToJwk for importing purposes according to standards.Added unit-test environment for testing. Added testing to CI.

Auch den privaten Key ein `x5c` (X.509 key chain) Attribut geben - planning#361

See merge request !6

Added verifications for: x5c chain, jwk key length, certificate key length and signature + hash algorithm. Also updated dependancies and poetry.lock file.

feat: examples to verify metadata (planning#239)

See merge request !7

The code would've been a little easier with external dependencies
but the way it's implemented now (0 external dependencies) is easier
to integrate in application code.

PKCS12 / JWK Tool

See merge request !5

This reverts commit b8c57834.

Callback validation script

See merge request !3

Derive JWKs from self-signed certificate

See merge request !2

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