Add ConvertibleToTransactionPayload interface

[cptartur]

Describe your changes

This PR attempts to standardize the behavior of toPayload method in Transactions by adding ConvertibleToTransactionPayload (subject to change) interface that indicates if Transaction (or any object for that matter) is convertible to TransactionPayload object.

This PR is a suggestion, if the used approach is not preferred by other developers, it can be closed.

Linked issues

Closes

Breaking changes

• This issue contains breaking changes

[THenry14]

👀

[codecov-commenter]

Codecov Report

Base: 62.67% // Head: 62.73% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (c9dec65) compared to base (9ca1029).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #180      +/-   ##
==========================================
+ Coverage   62.67%   62.73%   +0.05%     
==========================================
  Files          50       50              
  Lines        1243     1245       +2     
  Branches       81       81              
==========================================
+ Hits          779      781       +2     
+ Misses        442      440       -2     
- Partials       22       24       +2     

Impacted Files	Coverage Δ
...on/starknet/data/types/transactions/Transaction.kt	47.70% <100.00%> (ø)
...knet/data/types/transactions/TransactionPayload.kt	100.00% <100.00%> (ø)
...tlin/com/swmansion/starknet/crypto/NativeLoader.kt	29.03% <0.00%> (ø)

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[Solpatium]

I think this would add additional cognitive overhead for users and I don't see the benefit.
If we want every tx to have toPayload fn then I suggest adding it as an abstract method to Transaction.