Create HTTP contexts for legacy resource name

[jotok]

Is your feature request related to a problem? Please provide an existing Issue # , or describe.
We want the Performance Analyzer agent API for OpenSearch to be backward compatible with OpenDistro.

Describe the solution you are proposing
Adding HttpContexts that will resolve the old /_opendistro resource name.

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[sruti1312]

There is also the RCA API in 9600 port. Maybe we need to update that as well? Or, does this cover that?

[codecov-commenter]

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[dblock]

This needs tests and, if possible, to mark the old route deprecated.