fix: correct typos in comments

[maxtaran2010]

Fix several typos found in Go source file comments across the codebase.

Changes:

• addpartitionstotxn.go: fo -> for
• client.go: interract -> interact
• createpartitions.go: parititions -> partitions
• createtopics.go: thie -> the
• endtxn.go: represets -> represents, resposne -> response
• joingroup.go: assosiated -> associated, memmber -> member, reponse -> response
• leavegroup.go: indentify -> identity, occured -> occurred
• metadata.go: interpets -> interprets (two occurrences)
• protocol/buffer.go: farily -> fairly
• protocol/protocol.go: extention -> extension
• syncgroup.go: assignement -> assignment, goroup -> group, memeber -> member (multiple), assignemnt -> assignment
• transport.go: negotating -> negotiating

All changes are in comments only — no logic or API surface is affected.

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