Add search.maxResults setting

[rickpmartin]

This PR fixes: #8563 by adding a setting search.maxResults which sets the maximum number of search results returned. null (empty) can be used to return unlimited results.

Notes:

• The default functionality is unchanged (meaning we still have a default maximum of 10000).
• The original limitation was added due to a performance issue during replace in files: Massive replace makes window unresponsible and then crashes the window #8529
• Search only returns first 10,000 items found #90383 was already closed but it was never really fixed, the fix for that issue only added a warning when the maximum is reached.
• It is worth considering setting the default to unlimited, as other editors do not have this limitation and it is unexpected (there have been numerous issues opened to support this).

Related issues:

• Search only returns first 10,000 items found Search only returns first 10,000 items found #90383
• Investigate removing Max results limitation for Search and replace results Investigate removing Max results limitation for Search and replace results #8563
• search results have a limit of 10000 items search results have a limit of 10000 items #29120
• Replace in files will stop after 10000 items Replace in files will stop after 10000 items #51624

Preview:

Below is a preview showing the new setting functionality, and also a replace of ~240,000 lines without issue.

[ghost]

All CLA requirements met.

[roblourens]

Thanks for the PR. Want to also change the default to 20,000? 🚀

I am just still hesitant about blowing up underpowered machines. But I think 20k would be fine and we still have some time to get feedback in insiders before the next release.

[rickpmartin]

Sure thing, I've updated the default value to 20000.

I'm not sure if this is important but there are workflows awaiting approval as they require a maintainer to approve them. Is that something you are able to do?