[Feature]: Expose `locator.toString()` type/docs

[cpAdm]

🚀 Feature Request

Define toString() type and documentation for Locator type, added in v1.57

Example

No response

Motivation

When using the @typescript-eslint/no-base-to-string rule, ESLint will complain:

[yury-s]

@cpAdm do you want to take a stab at it? Should be solvable by adding toString() to the generated types via utils/generate_types/overrides.d.ts and utils/generate_types/overrides-test.d.ts.