Replace the type of client_id and actor_id in protobuf

[autumn-n]

What this PR does / why we need it:

A 24 bytes hex-encoded string can be replaced with a 12 bytes of array to reduce size of marshalled data with Protobuf.

Which issue(s) this PR fixes:

Fixes #36

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE, It just reduce the size of data between client and server.

Additional documentation:

Checklist:

• Added relevant tests or not required
• Didn't break anything

[codecov]

Codecov Report

Merging #145 (33b8c30) into main (8f26979) will increase coverage by 0.06%.
The diff coverage is 63.33%.

@@            Coverage Diff             @@
##             main     #145      +/-   ##
==========================================
+ Coverage   56.99%   57.05%   +0.06%     
==========================================
  Files          33       33              
  Lines        3090     3106      +16     
==========================================
+ Hits         1761     1772      +11     
- Misses       1152     1154       +2     
- Partials      177      180       +3     

Impacted Files	Coverage Δ
client/client.go	8.12% <0.00%> (ø)
pkg/document/time/actor_id.go	57.69% <60.00%> (+1.44%)	⬆️
yorkie/backend/db/db.go	66.66% <60.00%> (-33.34%)	⬇️
api/converter/from_pb.go	67.28% <100.00%> (ø)
api/converter/to_pb.go	85.53% <100.00%> (ø)
pkg/document/time/ticket.go	18.91% <100.00%> (+5.03%)	⬆️
yorkie/rpc/server.go	48.98% <100.00%> (ø)

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[hackerwins]

@autumn-n Thank you for sending PR. We'll review this soon.

[dc7303]

Thanks for the wonderful work 👍
I left some amendments and questions. After checking, please be honest with your opinion.

Question

I think the modify the JS SDK also needs to be done to profile this PR. If you let me know if you're modifying the JS SDK, I think we'll see how we can help.
Are you modifying the JS SDK?

About test

How about adding a unit test for the added method?
I think it would be nice to add the normal case and exception cases of the method. This is because it will serve as a document and a safeguard for developers who analyze and modify this method in the future.

[autumn-n]

@dc7303 Thanks for your comments

Question

I think the modify the JS SDK also needs to be done to profile this PR. If you let me know if you're modifying the JS SDK, I think we'll see how we can help.
Are you modifying the JS SDK?

Meanwhile, I'm already done. Once review has done, I will send a PR of JS SDK too.

About test

How about adding a unit test for the added method?
I think it would be nice to add the normal case and exception cases of the method. This is because it will serve as a document and a safeguard for developers who analyze and modify this method in the future.

Yes, you are right. I should have done that before. I'm gonna do it. In addition, It would be also great if there were more tests to figure out the intentions for new contributors.

[dc7303]

LGTM 👍 😄

[hackerwins]

LGTM. Thanks for the contribution.