an implementation of DMI: device and mapper management

[RyanZhaoXB]

What type of PR is this? /kind feature

What this PR does / why we need it: we have proposed the Device Management Interface in https://github.com/kubeedge/kubeedge/issues/3760. now we are implementing the interface in edgecore. thus the mapper can connect to edgecore through DMI to management device.

Which issue(s) this PR fixes:

Fixes #3760

Special notes for your reviewer:

Does this PR introduce a user-facing change?: no. this pr will not change the user-facing interface. the change is about the interface which the developer of mappers will use. the API of DMI is proposed in https://github.com/kubeedge/kubeedge/pull/3915

[RyanZhaoXB]

we are testing this pr and will reorganize the commits later.

[RyanZhaoXB]

@gy95 @fisherxu please help to review this pr. thanks!

[wackxu]

please add copyright header for every new added file

[wackxu]

Can you split the pr into two part, one pr is the proto interface definition and automatically generated code and vendor, the other pr is the interface implementation and related logic code modification， The proto interface definition is important, so we can review the proto interface definition first, also it is also convenient to review

[RyanZhaoXB]

Can you split the pr into two part, one pr is the proto interface definition and automatically generated code and vendor, the other pr is the interface implementation and related logic code modification， The proto interface definition is important, so we can review the proto interface definition first, also it is also convenient to review

it is a good idea. i have proposed a pr https://github.com/kubeedge/kubeedge/pull/3915 for the proto interface definition before but it is a little old. i will re-proposed it.

[RyanZhaoXB]

please add copyright header for every new added file

i have added the copyright header.

[RyanZhaoXB]

all the review comments have been modified. while it should be merged only after this pr(https://github.com/kubeedge/kubeedge/pull/4119) is merged.

[RyanZhaoXB]

all the review comments have been modified. please help me to re-check this pr. thanks.

[RyanZhaoXB]

the mapper of DMI is proposed in this pr(https://github.com/kubeedge/mappers-go/pull/78). this mapper is developed for modbus.

[kubeedge-bot]

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