Cross-compile ErgoScript compiler to JS

[aslesarenko]

In this PR:

• graph-ir module cross-compiled to JVM and JS
• sc module cross-compiled to JVM and JS
• Environment introduced to run code conditionally on JVM/JS platform
• Reconfigured ScalablyTyped
• Upgraded dependencies
• Upgraded sbt and Scala Compiler versions
• scala-js configured
• js.SigmaCompiler implemented
• First prototype of sigmastate-js is published

[codecov]

Codecov Report

Merging #885 (d8e4ccd) into v5.0.9-RC (c728da6) will increase coverage by 0.07%.
The diff coverage is 86.23%.

❗ Current head d8e4ccd differs from pull request most recent head 0c38343. Consider uploading reports for the commit 0c38343 to get more accurate results

@@              Coverage Diff              @@
##           v5.0.9-RC     #885      +/-   ##
=============================================
+ Coverage      77.67%   77.75%   +0.07%     
=============================================
  Files            248      251       +3     
  Lines          14851    14870      +19     
  Branches         569      582      +13     
=============================================
+ Hits           11536    11562      +26     
+ Misses          3315     3308       -7     

Impacted Files	Coverage Δ
common/shared/src/main/scala/scalan/AnyVals.scala	75.00% <0.00%> (-3.95%)	⬇️
common/shared/src/main/scala/scalan/TypeDesc.scala	59.25% <ø> (-3.71%)	⬇️
...shared/src/main/scala/scalan/util/Extensions.scala	59.52% <ø> (ø)
...ared/src/main/scala/special/collection/Colls.scala	84.61% <ø> (ø)
...ain/scala/special/collection/CollsOverArrays.scala	79.62% <ø> (ø)
...ed/src/main/scala/special/collection/package.scala	80.00% <ø> (ø)
...ir/shared/src/main/scala/scalan/DefRewriting.scala	64.70% <ø> (ø)
...ared/src/main/scala/scalan/GraphIRReflection.scala	56.93% <ø> (ø)
...raph-ir/shared/src/main/scala/scalan/Library.scala	65.85% <ø> (ø)
...-ir/shared/src/main/scala/scalan/MethodCalls.scala	58.82% <ø> (ø)
... and 53 more

... and 4 files with indirect coverage changes

[kushti]

import sigmastate.lang.TransformingSigmaBuilder and
import scalan.Nullable

are not used now

[aslesarenko]

fixed