Expand Metadata API

[cicoyle]

Developers should be able to access metadata information (https://docs.dapr.io/reference/api/metadata_api/) from their Java applications. This PR has added support for some, but not all metadata. We should eventually support all metadata. Please see this comment as to what is missing and should be added.

[salaboy]

Following on this PR, we should add the details mentioned by @cicoyle #1049

[artur-ciocanu]

@salaboy and @cicoyle I am not sure how I could assign this issue to me, so it is clear that it is worked on.

[cicoyle]

I assigned you to the issue. Thx @artur-ciocanu - if you want to going forward plz try commenting /assign and daprbot should assign you to the issue, like here

[artur-ciocanu]

I assigned you to the issue. Thx @artur-ciocanu - if you want to going forward plz try commenting /assign and daprbot should assign you to the issue, like here

Noted, thank you!