[v5.x] Refactor tests

[aslesarenko]

In this PR:

• test harness updated to reflect removal of v4.x interpreter
• more test cases added to cover possible MethodCalls in ErgoTree for some operations
• more unused code removed

[codecov]

Codecov Report

Merging #802 (f380584) into v5.0.1-RC (5fb56d0) will decrease coverage by 9.23%.
The diff coverage is 94.11%.

@@              Coverage Diff              @@
##           v5.0.1-RC     #802      +/-   ##
=============================================
- Coverage      71.75%   62.52%   -9.24%     
=============================================
  Files            247      247              
  Lines          19098    18626     -472     
  Branches         628      620       -8     
=============================================
- Hits           13704    11645    -2059     
- Misses          5394     6981    +1587     

Impacted Files	Coverage Δ
.../org/ergoplatform/validation/ValidationRules.scala	82.05% <ø> (-10.49%)	⬇️
...te/src/main/scala/sigmastate/eval/Evaluation.scala	53.06% <ø> (-13.79%)	⬇️
...ate/src/main/scala/sigmastate/eval/IRContext.scala	84.61% <75.00%> (+13.56%)	⬆️
...src/main/scala/sigmastate/eval/GraphBuilding.scala	95.38% <100.00%> (-1.63%)	⬇️
.../src/main/scala/sigmastate/eval/TreeBuilding.scala	93.53% <100.00%> (-0.47%)	⬇️
...src/main/scala/sigmastate/lang/SigmaCompiler.scala	100.00% <100.00%> (ø)
.../src/main/scala/sigmastate/eval/CostingRules.scala	14.80% <0.00%> (-84.30%)	⬇️
...rc/main/scala/sigmastate/eval/RuntimeCosting.scala	17.97% <0.00%> (-72.45%)	⬇️
...ain/scala/sigmastate/eval/CompiletimeCosting.scala	26.00% <0.00%> (-68.00%)	⬇️
...in/scala/sigmastate/utxo/ComplexityTableStat.scala	35.71% <0.00%> (-64.29%)	⬇️
... and 57 more

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[kushti]

Add ScalaDoc for TreeBuilding also.

Evaluation is not descriptive enough name I guess

Please specify in ScalaDoc comments whether classes belong to frontend compiler or tree interpreter.

[aslesarenko]

Please specify in ScalaDoc comments whether classes belong to frontend compiler or tree interpreter.

@kushti in #827 and #833 the consensus code is moved into separate module which doesn't depend on both compiler and graph-IR code. See interpreter and sc (aka sigma compiler) modules.