Clean config parameters

[wthrajat]

Aims to fix #248

• Removed internal parameters from MakerConfig and TakerConfig that should not be exposed to users.
• Hardcoded default values for internal parameters in maker/server.rs.
• Hardcoded default values for internal parameters in taker/api.rs.
• Replaced separate directory_server_onion_address and directory_server_clearnet_address fields with a unified directory_server_address field for both MakerConfig and TakerConfig.
• Set required_confirms to a default value of 1 for MakerConfig, removing it from user-facing configuration options.
• Adjusted the code to use the constants rather than the struct fields.
• Added documentation wherever needed.

[mojoX911]

Awesome. Thanks for doing this cleanup.

Our configs looks much better simpler and saner now.

Few more comments and its good to go.

[codecov]

Codecov Report

Attention: Patch coverage is 58.49057% with 22 lines in your changes missing coverage. Please review.

Project coverage is 74.80%. Comparing base (2f9f0aa) to head (0bbacec).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/taker/api.rs	48.00%	13 Missing ⚠️
src/maker/server.rs	44.44%	5 Missing ⚠️
src/taker/routines.rs	20.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #276      +/-   ##
==========================================
- Coverage   79.65%   74.80%   -4.86%     
==========================================
  Files          32       32              
  Lines        4945     4362     -583     
==========================================
- Hits         3939     3263     -676     
- Misses       1006     1099      +93     

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[mojoX911]

Ack