[Doc]--Set partition key for message when using function publish #7431
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Motivation
Pulsar release 2.4.0 supports setting partition key for messages when using function publish, as described in this PR: #4005
The code is updated but the doc is not updated accordingly.
Modifications
1: Update the doc based on the code updated.
2: also add some legacy missing methods in the context class of the python functions according to the code.
3: This update is only for Pulsar 2.4.0 release. No need to update docs in 2.4.1 and later releases as these docs have been updated.