[Feature]: Add (m)TLS configuration of Callbacks

[romanstrobl]

Description

Add new attributes when configuring callbacks via REST API:

• trustStoreContent for the trust store
• keyStoreContent for the key store

Validate that only location or content is used i.e. prevent accidental misconfiguration.

Acceptance criteria

Callbacks authentication can be configured using REST API using the trust store and key store files content.

The new stored content is used when establishing the TLS.

Old location setting is still valid and not deprecated.

Only location or content configuration is used at a time.

Technical specification

The trust store and key store data should be stored as base64 in CLOB column data types.

QA specification

Verify that only one configuration can be made i.e. when location is configured location is used, and vice versa, when content is configured content is used.

Verify that TLS and mTLS is working.

JIRA issue code

No response