Fix redirect HTTP method handling

[coletdjnz]

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Backported from #2861

Currently YoutubeDLRedirectHandler (which is based off the urllib redirect handler) makes all redirect requests with GET method, regardless of the original method and status code. This behaviour is inconsistent with standards and what browsers usually do.

This PR brings the method handling in line with RFC7231 and RFC7538 and what browsers tend to do. Requests v3 also does essentially the same thing.

This also fixes 307 & 308 redirects (they must retain the original method) - python/cpython#91306

The main changes are:

• by default, do not change method on redirect
• 303 uses GET (except for HEAD)
• 301 and 302 should change to GET from POST