feat: plat-6215 add support for rpc failovers and retries (#231)

* chore: solana rpc retries

* chore: fix tests

* chore: remove printlns

* chore: remove println

* chore: add more unit tests

* chore: more tests

* feat: add placeholder for should_mark_provider_failed in Solana

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Co-authored-by: Luis Urrutia <[email protected]>

Author: zeljkoX