feat: add treeland-ddm communication protocol

[calsys456]

For linuxdeepin/treeland#489 and linuxdeepin/ddm#34

[deepin-ci-robot]

Hi @apr3vau. Thanks for your PR. 😃

[deepin-ci-robot]

Hi @apr3vau. Thanks for your PR.

I'm waiting for a linuxdeepin member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[zccrs]

commit信息的格式检查失败

[calsys456]

commit信息的格式检查失败

已补充commit信息，通过检查

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: calsys456, ilmaya0211, zccrs

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