feat(python): Reintroduce Python span streaming docs

[sentrivana]

This reverts commit ba13b79.

We initially merged the streaming docs too early, so we had to revert. This PR reverts the revert and reintroduces the streaming docs again.

Changes on top:

• fixing sampling context examples as the format has changed (to be consistent with the old format)
• getting rid of all _experiments mentions as the options are now all top level (except for before_send_span, but we'll make a release with that before we merge this)

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[github-actions]

⚠️ Redirect Chain Issues Detected

This PR introduces or contains redirect chains that degrade SEO and add latency.

Content Links Pointing to Redirects (1 found)

These links point to URLs that redirect. Update them to point directly to the final destination:

File	Line	Current Link	Should Be
docs/platforms/python/tracing/configure-sampling/index.mdx	607	/platforms/python/configuration/sampling/#sampling-context	/platforms/python/sampling/#sampling-context

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Each redirect hop loses ~15% of SEO link equity and adds latency for users.