refactor: resolved all maker's todo

[0xEgao]

This pr aims to resolve all marked TODO in maker module, and fixes #703 partially

TODO's fixed-:
1-) Encapsulated the maker's watcher initialization into an api named as start_maker_watch_service to avoid code repetition.
2-) Created nostr_coinswap module to transfer bunch of api's from maker's server to a common place.
3-) Refactored the v2-maker logic to create ConnectionState after receiving SwapDetails from Taker, as GetOffer message usually contains empty string in swap-id.
4-) Uncommented a marked todo in maker handlers2 module.

[codecov]

Codecov Report

❌ Patch coverage is 72.41379% with 40 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.77%. Comparing base (776b75d) to head (2ebc164).
⚠️ Report is 87 commits behind head on master.

Files with missing lines	Patch %	Lines
src/nostr_coinswap.rs	59.32%	24 Missing ⚠️
src/maker/handlers2.rs	57.89%	8 Missing ⚠️
src/maker/server2.rs	73.91%	6 Missing ⚠️
src/taker/api2.rs	84.61%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #713       +/-   ##
===========================================
+ Coverage   68.87%   80.77%   +11.89%     
===========================================
  Files          35       50       +15     
  Lines        4932    14692     +9760     
===========================================
+ Hits         3397    11867     +8470     
- Misses       1535     2825     +1290     

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[mojoX911]

@0xEgao is this ready for review?

[0xEgao]

@0xEgao is this ready for review?
Not right now, will be ready for review tomorrow.