[TS] Add and refactor ops

[Lipen]

This PR adds new operators and refactor existing ones.

[Copilot]

Pull Request Overview

This PR adds new TypeScript operators and refactors existing operator implementations to improve test structure and maintainability. The changes primarily focus on expanding operator coverage, improving naming consistency, and restructuring test organization.

Key changes include:

• Addition of new operators: VoidOperator, UnaryPlus, NullishCoalescing, InOperator, DeleteOperator, and Bitwise operators
• Refactoring of existing operator tests to use more consistent naming patterns and utility functions
• Movement of Truthy and Strings classes from root samples to lang package
• Introduction of utility functions for test comparisons and DSL method building

Reviewed Changes

Copilot reviewed 82 out of 92 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
VoidOperator.ts	New operator test covering void operator behavior
UnaryPlus.ts	New operator test for unary plus conversion
NullishCoalescing.ts	New operator test for nullish coalescing (??)
InOperator.ts	New operator test for 'in' operator
DeleteOperator.ts	New operator test for delete operator
Bitwise.ts	New operator tests for bitwise operations
Remainder.ts	Refactored remainder operator tests with cleaner structure
Or.ts	Simplified logical OR operator tests
Neg.ts	Enhanced negation operator tests with additional cases
And.ts	Comprehensive refactor with manual DSL method building
Equality.ts	Expanded equality tests with new comparison cases
TypeOf.ts	Moved and renamed from Strings to proper location
Less.ts	Minor formatting and utility function updates
Util.kt	New utility functions for number comparisons
TsMethodTestRunner.kt	Enhanced test runner with better method resolution
Multiple test files	Consistent adoption of new utility functions and naming patterns

Comments suppressed due to low confidence (1)

usvm-ts/src/test/kotlin/org/usvm/samples/operators/And.kt:144

• [nitpick] This TODO comment appears multiple times in the file. Consider either implementing the missing falsy value handling or creating a more specific issue reference to track this work.

                        ret(const(5))

[Lipen]

Rebased and fixed according to review comments.