feat(invoice): add new invoice creation function and dependencies

[astral-bitlight]

[astral-bitlight]

Since RgbInvoice is currently a type alias for CallRequest, we can’t directly implement methods like new() on it. To address this, I propose refactoring it into a newtype wrapper (a zero-cost abstraction) with an explicit constructor

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 28 lines in your changes missing coverage. Please review.

Project coverage is 4.1%. Comparing base (79e68c1) to head (acb8248). Report is 151 commits behind head on v0.12.

Files with missing lines	Patch %	Lines
invoice/src/lib.rs	0.0%	28 Missing :warning:

Additional details and impacted files

@@          Coverage Diff           @@
##           v0.12   #305     +/-   ##
======================================
- Coverage    4.9%   4.1%   -0.7%     
======================================
  Files         11     13      +2     
  Lines       1298   1553    +255     
======================================
+ Hits          63     64      +1     
- Misses      1235   1489    +254     

Flag	Coverage Δ
rust	4.1% <0.0%> (-0.7%)	:arrow_down:

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[astral-bitlight]

I've added serde support and fixed constructor param issue

[dr-orlovsky]

@astral-bitlight is this PR is still actual and needed?

[astral-bitlight]

We can closed it for now