refactor: extract swap/src/monero/wallet.rs to new monero-wallet crate

[nabijaczleweli]

Closes #798

[binarybaron]

@silverf1sh I know you also wanted to work on this. @nabijaczleweli beat you to it but I still want to encourage contributions from others. I'll award you 0.1 XMR for a review of this PR.

Just comment on things you find confusing or that you think could be implemented in a cleaner fashion. @nabijaczleweli most likely has a better understanding of the codebase than you but your comment might still prove helpful! More eyes are always better.

[binarybaron]

@silverf1sh I'd like to merge this today or tommorow though so if you are intersted in reviewing this you must do it until then. Alternatively you can open a follow up PR to correct minor things.

[coldmartian]

Appreciate It. I'll review It today.

[binarybaron]

The docker tests are not compiling.

[nabijaczleweli]

All applied

[binarybaron]

LGTM, will merge once CI runs through

[binarybaron]

0.5 XMR paid out to @nabijaczleweli. 0.1 XMR paid out to @silverf1sh