Add missing required and drop unnecessary required

[Yang-33]

There is an inconsistency between the OpenAPI specification (and generated SDKs) and the actual API behavior.
This change updates the required or optional annotations to match the actual behavior.

The behavior of the Messaging API itself is unchanged at all. This is purely a bug fix for the OpenAPI spec and the generated SDKs.

Affected methods

operationId	parameter	fix
createAudienceGroup	description	missing required
createAudienceForUploadingUserIds	description	missing required
addAudienceToAudienceGroup	audienceGroupId	missing required
-	audiences	missing required
addUserIdsToAudience	audienceGroupId	missing required
createClickBasedAudienceGroup	description	missing required
-	requestId	missing required
createImpBasedAudienceGroup	description	missing required
-	requestId	missing required
updateAudienceGroupDescription	description	missing required
getNumberOfFollowers	date	incorrectly marked as optional
createRichMenu / validateRichMenuObject	size, selected, name, chatBarText, areas	missing required
createCoupon	reward	missing required
getSharedAudienceGroups	page	incorrectly marked as required

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PHP

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JAVA

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NODEJS

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GO

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PYTHON

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RUBY

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[Yang-33]

I'll prepare the test changes for some repositories first, then open the PR.