Update Custom Asset doc page with use cases on asset registering

[nancywu1]

Additional docs on how to register assets and transforms with use case examples written in all platforms

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📦 Published PR as canary version: 0.7.4--canary.348.13748

Try this version out locally by upgrading relevant packages to 0.7.4--canary.348.13748

[nancywu1]

/canary

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.88%. Comparing base (8bbb94e) to head (7c7ca9b).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #348      +/-   ##
==========================================
- Coverage   91.95%   91.88%   -0.07%     
==========================================
  Files         340      341       +1     
  Lines       27195    27237      +42     
  Branches     1945     1945              
==========================================
+ Hits        25006    25028      +22     
- Misses       2175     2195      +20     
  Partials       14       14              

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