Migrate GF classes to Scala (restructure part3)

[aslesarenko]

In this PR all GF classes migrated to Scala (step towards Sigma.js).
The regression was tested by comparing result of each operation between new Scala and old Java code and ensuring that all Sigma tests pass (see this commit for details)

[codecov]

Codecov Report

Merging #866 (0f4fa86) into v5.0.6-RC (250922b) will increase coverage by 0.11%.
The diff coverage is 84.35%.

@@              Coverage Diff              @@
##           v5.0.6-RC     #866      +/-   ##
=============================================
+ Coverage      75.59%   75.71%   +0.11%     
=============================================
  Files            218      220       +2     
  Lines          14180    14357     +177     
  Branches         458      512      +54     
=============================================
+ Hits           10720    10870     +150     
- Misses          3460     3487      +27     

Impacted Files	Coverage Δ
...tate/src/main/scala/sigmastate/SigSerializer.scala	98.33% <ø> (ø)
...tate/src/main/scala/sigmastate/UncheckedTree.scala	55.55% <ø> (ø)
...state/src/main/scala/sigmastate/UnprovenTree.scala	100.00% <ø> (ø)
...rc/main/scala/sigmastate/crypto/GF2_192_Poly.scala	79.59% <79.59%> (ø)
...ate/src/main/scala/sigmastate/crypto/GF2_192.scala	85.93% <85.93%> (ø)
...tate/src/main/scala/org/ergoplatform/ErgoBox.scala	92.30% <100.00%> (ø)
...ala/sigmastate/interpreter/ProverInterpreter.scala	95.71% <100.00%> (ø)
core/src/main/scala/scalan/MethodCalls.scala	56.45% <0.00%> (+1.61%)	⬆️

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