update csdk and remove useless code

[codecov[bot]]

Codecov Report

Base: 15.30% // Head: 31.25% // Increases project coverage by +15.94% :tada:

Coverage data is based on head (5748ce5) compared to base (8632e9c). Patch coverage: 43.39% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev-3.0.0 #199 +/- ## ============================================== + Coverage 15.30% 31.25% +15.94% ============================================== Files 6 5 -1 Lines 1437 704 -733 ============================================== Hits 220 220 + Misses 1168 432 -736 - Partials 49 52 +3 ``` | [Impacted Files](https://codecov.io/gh/FISCO-BCOS/go-sdk/pull/199?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FISCO-BCOS) | Coverage Δ | | |---|---|---| | [client/connection.go](https://codecov.io/gh/FISCO-BCOS/go-sdk/pull/199?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FISCO-BCOS#diff-Y2xpZW50L2Nvbm5lY3Rpb24uZ28=) | `34.93% <39.21%> (-0.53%)` | :arrow_down: | | [client/go\_client.go](https://codecov.io/gh/FISCO-BCOS/go-sdk/pull/199?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FISCO-BCOS#diff-Y2xpZW50L2dvX2NsaWVudC5nbw==) | `31.53% <47.27%> (+1.56%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FISCO-BCOS). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=FISCO-BCOS)

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