Replaces scope-safe builder usage in Apalache internals with scop-unsafe builder usage

[Kukovec]

• [ ] Tests added for any new code
• [x] Ran make fmt-fix (or had formatting run automatically on all files edited)
• [ ] Documentation added for any new functionality
• [x] Entries added to ./unreleased/ for any new functionality

The unsafe builder leverages native scala objects, and is not susceptible to stack-depth issues, unlike the State-based builder.

The changes introduced are as follows:

• ScopeUnsafeBuilder is added as an analogue to ScopedBuilder, from existing unsafe builder components
• Unsafe components have been changed to trait from class to facilitate inheritance
• Constructors for typed operator parameters have been separated out and are reused across both builders
• tlaU is added as a convenience instance, analogous to at.forsyte.apalache.tla.types.tla
• BuilderUT and BuilderT have been added to the convenience imports, representing TlaEx and TBuilderInstruction respectively. All instances of TBuilderInstruction have been replaced with BuilderT
• In oreder to avoid even more refactoring, imports of the scoped builder, at.forsyte.apalache.tla.types.tla have been systematically replaced with at.forsyte.apalache.tla.types.{tlaU => tla, BuilderUT => BuilderT}.
• Places where map was used over BuilderT (e.g. _.map(simplifier.simplifyShallow)) have been replaced with abstract methods (e.g. applySimplifyShallowToBuilderEx), overloaded for BuilderT and BuilderUT.

No rule or data structure semantics have been modified.

[konnov]

Shall we merge this one?

[Kukovec]

Shall we merge this one?

Let me just add ./unreleased/