Close issue and write mkdocs documentation

[shreyashankar]

Add limit parameter to Map, Filter, Reduce, and Extract operations to cap the number of processed outputs.

For Filter operations, the limit specifically counts only the documents that pass the filter condition (i.e., evaluate to true). This ensures that the operation continues to evaluate inputs until the specified number of kept documents is reached, rather than simply stopping after processing a fixed number of initial inputs.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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