Added strings AST vs BINARY_OP benchmarks

[lamarrr]

Description

This merge request implements benchmarks to compare the strings AST and BINARY_OPs. It also moves out the common string input generator function to a common benchmarks header as it is repeated across other benchmarks.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[GregoryKimball]

@davidwendt would you also please take a look?

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