Add transcoder for Unregister as validator txn type. Add support for approve component for this new txn type

[lazynina]

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[lazynina]

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• Add support for coin lockup txn types #297
• Add transcoder for Unjail Validator txn type. Add approve UI support for this new txn type. #296
• Add transcoder for Unlock stake txn type. Add support for approve UI for this new txn type #295
• Add transcoder for Unstake txn type. Add support for approve component for this new txn type. #294
• Add transcoder for stake transaction metadata. Add support for approve component for this new txn type. #293
• Add transcoder for Unregister as validator txn type. Add support for approve component for this new txn type #292 👈
• Add transcoder for Register as validator transaction. Add support for approve component for this txn type #291
• feature/proof-of-stake #290 : 2 other dependent PRs (#298 , #301 )
• main

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