Fix ModelUploader bug & Update demo_tracing_model_torchscript_onxx.ipnyb to use register function

[thanawan-atc]

Description

• Have ModelUploader add model_content_size_in_bytes field to model config file so that there is no error when register_model is invoked because of model_content_size_in_bytes being null.
• Update demo_tracing_model_torchscript_onxx.ipnyb to use register_model function

Issues Resolved

#184

Check List

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[dhrubo-os]

We also need to add a changelog.

An workflow is failing: https://github.com/opensearch-project/opensearch-py-ml/actions/runs/5407865644/jobs/9843236489?pr=185

You need to add a section here [Fixed in 1.1.0]: https://github.com/opensearch-project/opensearch-py-ml/blob/main/CHANGELOG.md

LMK if you have any question.

[codecov]

Codecov Report

Merging #185 (8d61d11) into main (03199fb) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #185   +/-   ##
=======================================
  Coverage   90.80%   90.81%           
=======================================
  Files          37       37           
  Lines        4047     4050    +3     
=======================================
+ Hits         3675     3678    +3     
  Misses        372      372           

Impacted Files	Coverage Δ
opensearch_py_ml/ml_commons/ml_common_utils.py	100.00% <100.00%> (ø)
opensearch_py_ml/ml_commons/model_uploader.py	97.50% <100.00%> (+0.06%)	⬆️