Endpoint for governance related certificates within tx

[slowbackspace]

Blockfrost is missing an endpoint for tx certificates related to registering drep, deregistering drep, delegation to drep,...

[slowbackspace]

@jjyutm4532 awesome work. could you please now open PR with implementation in https://github.com/blockfrost/blockfrost-backend-ryo. Thank you.

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HUH I GUESS AI WON'T STEAL MY JOB YET

[vladimirvolek]

You need to pay after the initial PR 💸