#38291: feat: add CCache

[sokoide]

Description

• Support Kerberos credential cache by adding use_ccache and ccache_file config parameters.

Link to tracking issue

Fixes #38291

Testing

Manually teseted by sending to a Kerberized Kafka broker with the following config.

exporters:
  kafka:
    protocol_version: 7.6.0
    topic: otelcol
    partition_traces_by_id: true
    brokers:
      - my_broker_host_name:9092
    auth:
      kerberos:
        service_name: 'myservice'
        realm: 'MY.REALM'
        # use credential cache
        use_ccache: true
        ccache_file: '/tmp/krb5cc_12345'
        username: 'foo'
        config_file: '/etc/krb5.conf'
        disable_fast_negotiation: true

Documentation

• use_ccache (bool) : if this is true and use_keytab is false/not-specified, OTELCOL connects to the brokers using Kerberos ccache
• ccache_file (string): path to the credential cache file

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[MovieStoreGuy]

Please also add some tests to validate this change.