Configurable Middleware Position for Django Instrumentation

[saichander17]

Fixes https://github.com/open-telemetry/opentelemetry-python-contrib/issues/1781

This PR has addressed all the comments present in https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2834 so far. Raising it separately to accelerate merging of this code.

cc: @xrmx @lzchen

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[saichander17]

Closing this by marking it as duplicate of https://github.com/open-telemetry/opentelemetry-python-contrib/pull/2912