[Doc] Add guides for "consumer" and "txn" to "Development" chapter

[Anonymitaet]

Consumer

Fix #8996

Txn

#11235 (comment)

[kaori-seasons]

@Anonymitaet I will do this

[Anonymitaet]

@complone many thanks! You can ping me and @congbobo184 if you need a doc review.

[kaori-seasons]

@Anonymitaet @congbobo184

I can understand it as: In pull-8996, the code submitted by user @codebobo184 lacks documentation on the ack mechanism confirmation guarantee after the message is reposted And this section belongs to the Transactions section, as mentioned here pull-11235
The relevant unit test is ServerCnxTest#testAckCommand
ConsumerAckListTest#testBatchListAck

I need to run the above test to supplement the relevant documents. Can this be understood?

[codelipenghui]

The issue had no activity for 30 days, mark with Stale label.

[liangyepianzhou]

@complone
You can try to understand this modification based on the tests here, and then add the missing parameters.
I can also help with this if you don't have time. please reply as soon as possible, thank you