fix: Extract aliased constants from identifiers

[fmoletta]

When constants are imported from other modules, they appear as an alias in the compiled json. As we didn't take them into account when creating the constants map, hints that imported aliased constants would fail. For example:

"starkware.cairo.common.cairo_keccak.keccak.BLOCK_SIZE": {
            "destination": "starkware.cairo.common.cairo_keccak.packed_keccak.BLOCK_SIZE",
            "type": "alias"
        },
        "starkware.cairo.common.cairo_keccak.packed_keccak.BLOCK_SIZE": {
            "type": "const",
            "value": 3
        },

Here the hint executed with access to scope starkware.cairo.common.cairo_keccak.keccak needs the alias in order to access the BLOCK_SIZE constant imported from starkware.cairo.common.cairo_keccak.packed_keccak

[codecov-commenter]

Codecov Report

Merging #278 (ef175d1) into main (edaabf3) will increase coverage by 0.06%.
The diff coverage is 82.35%.

@@            Coverage Diff             @@
##             main     #278      +/-   ##
==========================================
+ Coverage   58.67%   58.73%   +0.06%     
==========================================
  Files          41       41              
  Lines        5249     5264      +15     
==========================================
+ Hits         3080     3092      +12     
- Misses       1911     1914       +3     
  Partials      258      258              

Files Changed	Coverage Δ
pkg/parser/parser.go	57.89% <ø> (ø)
pkg/vm/program.go	35.18% <82.35%> (+17.23%)	⬆️

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