feat: Convert verbatim into a single builtin with literal arguments

[DeVikingMark]

Implements #15805 by:

• Add new verbatim(n, m, bytecode, ...) function with three literal arguments:

  • n: number of input slots (0-99)
  • m: number of output slots (0-99)
  • bytecode: string literal with the bytecode

• Keep legacy verbatim_<n>i_<m>o functions for backward compatibility

• Update documentation to describe the new API and mark old functions as deprecated

• Add comprehensive tests for both syntax variants

This simplifies the implementation and usage, while maintaining the same functionality.

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