multi: add upfront-shutdown-address to lnd.conf.

[NishantBansal2003]

Change Description

This PR introduces a new configuration option, upfront-shutdown-address, in the lnd.conf file.
fixes: #7964

• Added a new configuration option in lnd.conf to specify an upfront shutdown address.
• When set, this ensures that funds from a channel closure are transferred to the specified address.
• The behavior applies to both funder and fundee, with the ability to override it during openchannel and/or channel acceptor.

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Integration tests are provided to validate this new functionality.

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[NishantBansal2003]

PTAL @yyforyongyu

[NishantBansal2003]

Hey @yyforyongyu, could you take a look at this PR and share any comments if you have any? Thanks!

[Abdulkbk]

@NishantBansal2003 do you mind rebasing and fixing the conflicts?. I want to take a look.

[NishantBansal2003]

@NishantBansal2003 do you mind rebasing and fixing the conflicts?. I want to take a look.

sure, working on it now...

[NishantBansal2003]

I rebased this. I want to add that this was a relatively old PR at the time, and I was a beginner with LND and the Lightning Network as a whole (I still am ;)). Please let me know if there are any loose ends that need to be addressed, and if additional unit tests or itests could be added.