feat(taosc): optimize encoder/decoder logic for SClientHbReq

[wangmm0220]

Description

Issue(s)

• Close/close/Fix/fix/Resolve/resolve: Issue Link
• https://taosdata.feishu.cn/wiki/UGCrwawLeiVTcjkNcELcTScYnRe

Checklist

Please check the items in the checklist if applicable.

• Is the user manual updated?
• Are the test cases passed and automated?
• Is there no significant decrease in test coverage?

[gemini-code-assist]

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[Copilot]

Pull request overview

This PR aims to optimize the SClientHbReq/SClientHbBatchReq encoding/decoding path (primarily by relying on tStartEncode/tEndEncode framing instead of extra length-calculation logic) and adds unit tests to cover codec + compatibility scenarios.

Changes:

• Refactor SClientHbReq codec to use tStartEncode/tStartDecode framing and adjust fields being encoded/decoded.
• Simplify SClientHbBatchReq codec loop by removing per-item pre-length computation / sub-decoder logic.
• Add new GTest coverage for SClientHbBatchReq encode/decode and compatibility scenarios.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 7 comments.

File	Description
source/common/src/msg/tmsg.c	Refactors SClientHbReq/SClientHbBatchReq encoding/decoding logic and field layout.
source/common/test/tmsgTest.cpp	Pulls new batch HB tests into the existing tmsgTest binary.
source/common/test/SClientHbBatchReq.cpp	Adds new unit tests + “old/new” codec helpers for heartbeat batch compatibility.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

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