feat: add model version streaming

[gt2345]

Description

Add model version streaming, this is not yet exposed to the WebUI.
There will be a separate PR for EE to handle rbac.

Test Plan

Creating/editing/deleting model and model version work as expected.
Connect to ws://localhost:8080/stream, should be able to subscribe and unsubscribe for modelversions.
Sample message:

{
    "Sync_ID": "5vdsfsd",
    "Known": {
        "Projects": "63",
        "models": ""
    },
    "Subscribe": {
        "projects": {
            "project_ids": [13],
            "since": 0
        },
        "models": {
            "model_ids": [11],
            "user_ids": [1],
            "model_names": ["eee"]
        },
        "modelversions": {
            "model_ids": [15]
        }
    } 
}

Commentary (optional)

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

Ticket

MD-262

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[codecov]

Codecov Report

Attention: Patch coverage is 66.00985% with 69 lines in your changes are missing coverage. Please review.

Project coverage is 53.23%. Comparing base (2c6fec7) to head (ecff7d3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9029      +/-   ##
==========================================
+ Coverage   46.16%   53.23%   +7.06%     
==========================================
  Files        1171      770     -401     
  Lines      143382    82363   -61019     
  Branches     2410        0    -2410     
==========================================
- Hits        66196    43843   -22353     
+ Misses      76981    38520   -38461     
+ Partials      205        0     -205     

Flag	Coverage Δ
backend	43.37% <72.56%> (+0.02%)	⬆️
harness	63.99% <38.46%> (+1.64%)	⬆️
web	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
master/internal/stream/authz_basic_impl.go	87.50% <100.00%> (+4.16%)	⬆️
master/internal/stream/messages.go	0.00% <ø> (ø)
master/internal/stream/models.go	63.54% <100.00%> (ø)
master/internal/stream/projects.go	77.01% <100.00%> (ø)
master/internal/stream/subscription.go	96.00% <100.00%> (+1.17%)	⬆️
master/internal/stream/test_util.go	70.66% <100.00%> (+2.09%)	⬆️
master/internal/stream/util.go	69.49% <100.00%> (ø)
master/internal/stream/publisher.go	66.53% <95.00%> (+1.44%)	⬆️
master/cmd/stream-gen/main.go	0.00% <0.00%> (ø)
harness/determined/common/streams/_client.py	78.72% <60.00%> (-1.28%)	⬇️
... and 2 more

... and 415 files with indirect coverage changes

[ashtonG]

frontend code ok!

[corban-beaird]

Looks great! 🚀

[azhou-determined]

lgtm