[WIP]feat(layotto-lite): use layotto as a sdk ,not a sidecar

[seeflood]

What this PR does:
I want to develop a new go packae called layotto-lite , which aims to give users another choice:
use layotto as a sdk ,not a sidecar

• refactor go client and remove redundent constructor function
• make go client easy to do DI(dependency injection)
• layotto-lite support grpc API without stream
• add design doc
• component initialization
• layotto-lite support grpc stream
• layotto-lite support appcallback
• add examples
• split layotto into two modules
• make layotto-lite smaller
• add doc

RPC api won't be involved in this first PR

Why I want to do this:
See section 5 in #309

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[codecov]

Codecov Report

Merging #312 (09ae2ba) into main (7a133d2) will not change coverage.
The diff coverage is n/a.

❗ Current head 09ae2ba differs from pull request most recent head b0c2f48. Consider uploading reports for the commit b0c2f48 to get more accurate results

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##             main     #312   +/-   ##
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  Coverage   56.65%   56.65%           
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  Files          48       48           
  Lines        2058     2058           
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  Hits         1166     1166           
  Misses        769      769           
  Partials      123      123           

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