[NWC] add hold invoice support

[frnandu]

fixes #148
related to getAlby/hub#1298

[codecov]

Codecov Report

Attention: Patch coverage is 13.20755% with 46 lines in your changes missing coverage. Please review.

Project coverage is 71.27%. Comparing base (8ed70f0) to head (d14eb79).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
...ackages/ndk/lib/domain_layer/usecases/nwc/nwc.dart	0.00%	16 Missing ⚠️
...yer/usecases/nwc/requests/cancel_hold_invoice.dart	0.00%	7 Missing ⚠️
...yer/usecases/nwc/requests/settle_hold_invoice.dart	0.00%	7 Missing ⚠️
.../lib/domain_layer/usecases/nwc/nwc_connection.dart	0.00%	5 Missing ⚠️
...ib/domain_layer/usecases/nwc/nwc_notification.dart	28.57%	5 Missing ⚠️
...layer/usecases/nwc/requests/make_hold_invoice.dart	0.00%	5 Missing ⚠️
...main_layer/usecases/nwc/requests/make_invoice.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
- Coverage   71.98%   71.27%   -0.72%     
==========================================
  Files         113      116       +3     
  Lines        3851     3895      +44     
==========================================
+ Hits         2772     2776       +4     
- Misses       1079     1119      +40     

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[frnandu]

added support for 1-click flow NWC deeplink nostr-protocol/nips#1777