Cardano Updates

* Fix for tx_info plutus contract for types other than spend

* Updated sql to improve performance.

Tests done show similar performance as previous version.

* typo from test

* Remove output utxo link in contract as there is no logic to connect it to inputs spending

* Add 13.1.0.0 indexes

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Co-authored-by: RdLrT <[email protected]>

* Fix for tx_info plutus contract for types other than spend

* Updated sql to improve performance.

Tests done show similar performance as previous version.

* typo from test

* Remove output utxo link in contract as there is no logic to connect it to inputs spending

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Co-authored-by: RdLrT <[email protected]>

added ETRNL logo

- Add account_utxos & specs update, closes #146
- Fix pool_delegators endpoint specs doc, closes #157
- Add param_updates, closes #158