[WIP] ✨ Update to code-generator/v3

[ntnn]

Summary

Build with the new and improved code-generator/v3

See #46 without the code-gen noise

Related issue(s)

Requires kcp-dev/code-generator#111
Closes #46

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[ntnn]

Setting to WIP again - the kcp unit and integration tests are working fine but I'm getting reproducible errors in the e2e tests.

[kcp-ci-bot]

@ntnn: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-client-go-verify	940cbc2	link	true	/test pull-client-go-verify

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