Fix RPC bugs

[adriantpaez]

resolves #350, resolves #352

Description

Fix bugs on the RPC related to errors and params management.

Changes:

• Fix starknet_getStorageAt params order
• Add custom error types: NewUnexpectedError, NewNotImplementedError, NewInvalidStorageKey
• Improve the error management on getBlockById function
• Check params on starknet_call
• Check BlockId is non-negative if is a number

Types of changes

• Bugfix (non-breaking change which fixes an issue)

Testing

Requires testing: Yes

Did you write tests??: No (Now we are testing these bugs by hand)

Documentation

If this requires a documentation update, did you add one? No

[codecov[bot]]

Codecov Report

Merging #360 (2650e85) into main (7996505) will decrease coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #360      +/-   ##
==========================================
- Coverage   99.62%   99.62%   -0.01%     
==========================================
  Files          55       55              
  Lines        6470     6467       -3     
==========================================
- Hits         6446     6443       -3     
  Misses         24       24              

Flag	Coverage Δ
unittests	99.62% <ø> (-0.01%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/crypto/weierstrass/weierstrass.go	100.00% <0.00%> (ø)

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