[Enhancement] SendMessageRequestHeader, SendMessageBatchRequestHeader and SendMessageBatchV2RequestHeader have almost same body

[pandaapo]

Search before asking

• [X] I had searched in the issues and found no similar issues.

Enhancement Request

• SendMessageRequestHeader, SendMessageBatchRequestHeader and SendMessageBatchV2RequestHeader have almost same body.
• Assert.assertThat() is deprecated in junit.
• There is a more convenient method of initializing Map.

Describe the solution you'd like

• Abstract SendMessageRequestHeader, SendMessageBatchRequestHeader and SendMessageBatchV2RequestHeader these three classes.
• Use other api of junit.
• Use ImmutableMap.of() to create and init Map.

Are you willing to submit PR?

• [X] Yes I am willing to submit a PR!

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