fix(types): getXXX methods return instances

[Dam-Buty]

No description provided.

[linear]

ENG-1585 TS SDK : getXXX methods should return instances

There are some inconsistencies in there, for example :

• getStep is typed as returning a Step , but in fact it returns a plain object of shape StepFields
• getThread is typed as returning any, returns a ThreadFields object
• there are probably more inconsistencies

The fact that these methods don't return actionable instances (with the .send method, etc…) is a bit of a missed opportunity. In scenarios where you want to work on an already created entity, you have to do that little dance which is annoying.

Dod

• types are fixed
• entities are instantiated as their respective class
• this is non-breaking for existing project which might already do the little dance. Basically just check that re-instantiating an instance is okay.

[Dam-Buty]

this is the only "breaking" change i could identify. Existing (erroneous) code may rely on the fact that getThread used to be typed any and not include any null checks.