rename API/function/variable names

[ylwu-amzn]

Description

Rename APIs

• upload model -> register model
• load model -> deploy model
• unload model -> undeploy model

With these changes, we also changed other places

• model state, for example LOADED -> DEPLOYED
• functions names, for example uploadModel -> deployModel
• variable names, for example uploadInput -> registerModelInput

Issues Resolved

#823

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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[rbhavna]

If we are using register for full model model, why not use register model chunk here?

[ylwu-amzn]

We change to register mainly for extending the API scope to support pre-trained model on model repo and virtual remote models. This upload model chunk API doesn't need to extend its scope. But I will reconfirm with UX/PM.

[ylwu-amzn]

I'd suggest go ahead and review other parts. We can create a new PR for the model chunk APIs if needed.

[ylwu-amzn]

Still waiting for more comments from UX/PM. Will merge this PR for now. May cut a new PR when get finalized decision.

[codecov-commenter]

Codecov Report

Merging #822 (1d2ba9f) into 2.x (4df13e3) will decrease coverage by 0.16%.
The diff coverage is 84.89%.

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@@             Coverage Diff              @@
##                2.x     #822      +/-   ##
============================================
- Coverage     84.90%   84.74%   -0.16%     
+ Complexity     1626     1622       -4     
============================================
  Files           135      135              
  Lines          6036     6059      +23     
  Branches        589      592       +3     
============================================
+ Hits           5125     5135      +10     
- Misses          659      668       +9     
- Partials        252      256       +4     

Flag	Coverage Δ
ml-commons	84.74% <84.89%> (-0.16%)	⬇️

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

Impacted Files	Coverage Δ
...l/engine/algorithms/ad/AnomalyDetectionLibSVM.java	86.84% <0.00%> (ø)
...va/org/opensearch/ml/task/MLPredictTaskRunner.java	82.14% <0.00%> (ø)
.../main/java/org/opensearch/ml/task/MLTaskCache.java	93.75% <ø> (ø)
.../java/org/opensearch/ml/utils/RestActionUtils.java	81.63% <ø> (ø)
...h/ml/action/models/DeleteModelTransportAction.java	85.07% <25.00%> (-3.99%)	⬇️
...ain/java/org/opensearch/ml/task/MLTaskManager.java	68.33% <50.00%> (ø)
.../opensearch/ml/rest/RestMLRegisterModelAction.java	73.07% <73.07%> (ø)
...n/java/org/opensearch/ml/model/MLModelManager.java	78.92% <76.62%> (ø)
...c/main/java/org/opensearch/ml/engine/MLEngine.java	83.58% <80.00%> (ø)
...n/java/org/opensearch/ml/cluster/MLSyncUpCron.java	76.92% <80.00%> (+0.51%)	⬆️
... and 18 more

... and 2 files with indirect coverage changes

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