xds/resolver: add a way to specify the xDS client to use for testing purposes #7771
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#a71-xds-fallback
#xdsclient-refactor
Addresses #6902
This PR adds a way to specify the exact xDS client to be used by the xDS resolver. Currently we only have a way of specifying the bootstrap configuration to use.
This change is required for fallback tests where we need to be able to configure xDS clients with options (like idle authority timeout) that are not part of the bootstrap configuration.
Subsequent PRs will use this functionality.
RELEASE NOTES: none