Limit and Truncate Grep Search output

[RomneyDa]

Description

• Adds a maxResults option to IDE getSearchResults methods
• Implements this for the Grep Tool and search context provider
  • I decided on 100 results by default for agent AND 4500 truncation limit, with an additional warning context item in the case of truncation. This seems to work well
  • Updates the grep tool description to prompt it to be a bit more targeted with its queries
  • I made the Search context provider a bit more liberal since the user is choosing the query, with a default of 200 results, configurable with maxResults context block param, and no hard character limit
• Adds unit tests for grep output formatting
• Updates the docs and config schema

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[recurseml]

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[recurseml]

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[sestinj]

great. we talked about this, so I won't repeat the whole logic around why this lgtm. good tests