Adds docs for client initialisation with env variables

[elena-kolevska]

Description

Added a section in the docs on initialising the client and the supported environment variables

Issue reference

dapr/docs#3921

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Extended the documentation

N/A

• Code compiles correctly
• Created/updated tests

[elena-kolevska]

@cicoyle could you please review this, I'm not very familiar with the java-sdk. Thanks 🙏

[cicoyle]

Just a small nit: Initialising -> Initializing && standardising -> standardizing. I'm not 100% confident I see the parsing for the tls=true in our codebase. I might've just missed it though. Once this is confirmed, then I think the PR is good to go. Thank you for documenting this 🎉

[cicoyle]

we may be missing a conditional, like:

      if (uri.getQuery() != null && uri.getQuery().contains("tls=true")) {
        insecure = false;
      }

[elena-kolevska]

Thanks Cassie! I realised I had some copy/paste leftovers from the python-sdk. I fixed that now.
The ?tls query parameter was added in this proposal.
I removed the example for now, so we're not showing the grpc endpoint with "https", and we can come back to this and add it, once the support for tls is added.

[cicoyle]

Thanks for updating the docs 🎉

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7eb24ff) 77.31% compared to head (edb7752) 77.31%.

❗ Current head edb7752 differs from pull request most recent head 50968fd. Consider uploading reports for the commit 50968fd to get more accurate results

Additional details and impacted files

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  Complexity     1537     1537           
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  Files           143      143           
  Lines          4642     4642           
  Branches        541      541           
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  Hits           3589     3589           
  Misses          778      778           
  Partials        275      275           

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