feat(python): Document event processors

[alexander-alderman-webb]

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JavaScript, .NET and Ruby have similar documentation. Since we reference event processors in #14860, there should be a page explaining what event processors are in the first place.

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[codecov]

Bundle Report

Changes will increase total bundle size by 7.13kB (0.03%) ⬆️. This is within the configured threshold ✅

Detailed changes

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sentry-docs-server-cjs	12.61MB	7.14kB (0.06%) ⬆️

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view changes for bundle: sentry-docs-server-cjs

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../instrumentation.js	-3 bytes	1.1MB	-0.0%
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[sfanahata]

This is a nice addition. Thanks for writing it up! The only thing I'd change is to pull up the actual methods we're calling out in this doc more directly. It felt a little convoluted to understand which ones you were talking about until we got to the end. I'd love to see them listed at the top of the doc too.

[sfanahata]

Great add! This is good to go. Thanks.