Draft: Add configuration support for target service authority

[raflFaisal]

This PR

Adding a new config option that allows flagd clients to override the authority. This is useful when running gRPC sync service behind proxy e.g. envoy, istio etc. For more details, please refer this PR

• adds this new feature

Related Issues

open-feature/java-sdk-contrib#949

Notes

Follow-up Tasks

How to test

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[github-actions]

Hey there and thank you for opening this pull request! 👋🏼

We require pull request titles to follow the Conventional Commits specification and it looks like your proposed title needs to be adjusted.
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Unknown release type "Draft" found in pull request title "Draft: Add configuration support for target service authority". 

Available types:
 - feat: A new feature
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[raflFaisal]

PR is created in forked repo so closing this one