build funding transaction for direct parent-child inscriptions

[dannybabbev]

User story:
User signs with their wallet a transaction that sends the inscription id and a payment amount to fund the direct inscription costs produced by the /inscribe endpoint with parent/child enabled. The sending of the parent and the paying of the inscription fees happens in a single transaction to optimize the costs.

Requirements:

• create new method that takes inscription ids, bitcoin payment amount and receive addresses for inscriptions and btc amount
• connect to the browser wallet: xverse, leather, etc.
• verify the inscription id is inside
• verify that the user has the requested amount of btc
• build a transaction that sends the BTC amount as the first output and the inscription as the second
• sign with wallet
• broadcast tx
• method has to be flexible such that we can send multiple inscription ids at once.

[dannybabbev]

@T1-O this was originally mike's but you already did this, right? I am assigning the issue to you so pls take a look. Close if everything is done. Thanks