Staking API (2023-11-15)

🛠️ We've made some fixes and improvements:

• [Polkadot] Fixed issues with Polkadot Deactivation Intent:
• Fixed missing amount and deactivationType fields in the Polkadot Deactivation Intent response.
• Fixed the lack of appropriate error messages when creating a Deactivation Intent.
• [Solana] Removed the unused wallets_amount in the schema of the /withdrawable-amount endpoint.
• Learn more in the Solana - Get Withdrawable Amount endpoint.
• [NEAR] Removed the unused wallets_amount in the schema of the /withdrawable-amount endpoint.
• Learn more in the NEAR - Get Withdrawable Amount endpoint.
• [Cosmos] Removed the unused wallets_amount in the schema of the /withdrawable-amount endpoint.
• Learn more in the Cosmos - Get Withdrawable Amount endpoint.