Issue title: GUI for header filters
 Issue body: Currently JSON and Avro filters can be added via Hermes-console. Thanks to #753 we can also add Header filters via REST API. Unfortunately, Header filters aren’t supported via GUI. It would be nice to have this support in Hermes-console. Furthermore, it should be enabled/disabled by configuration as not all environments have to support Headers filters.
 Comments: 
 Comment 0: Hi, can I take this one?
 Comment 1: @qrman sure, you can
 Comment 2: @druminski Can you explain what do you mean by saying: `it should be enabled/disabled by configuration as not all environments have to support Headers filters`?

Should filtering section be visible only when some flag in configuration is set? Does Hermes (`SubscriptionEndpoint`) throw any exception when headers filters are set and environment doesn't support filtering?
{'source': 'GithubIssues', 'repo_name_with_owner': 'allegro/hermes', 'issue_id': 460040627, 'repo_stars': 756.0}