Update Examples

[lpatino10]

This PR updates the example files included in the SDK. This involves:

• Updating the SDK version used in the examples
• Removing examples for deprecated services
• Changing references to Conversation to Assistant
• Updating any code broken by the SDK version update

These updates should clear up any confusion caused by looking at the examples and trying to use the newest version of the SDK.

[codecov-io]

Codecov Report

Merging #908 into develop will decrease coverage by <.01%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop     #908      +/-   ##
=============================================
- Coverage      65.84%   65.84%   -0.01%     
+ Complexity      2621     2613       -8     
=============================================
  Files            551      547       -4     
  Lines          14122    14073      -49     
  Branches         818      817       -1     
=============================================
- Hits            9299     9266      -33     
+ Misses          4409     4393      -16     
  Partials         414      414

Impacted Files	Coverage Δ	Complexity Δ
...guage_classifier/v1/NaturalLanguageClassifier.java	57.81% <0%> (-4.69%)	8% <0%> (-1%)
...e_classifier/v1/model/CreateClassifierOptions.java	57.5% <0%> (ø)	5% <0%> (ø)	⬇️
..._classifier/v1/model/ClassificationCollection.java
...al_language_classifier/v1/model/ClassifyInput.java
...l_language_classifier/v1/model/CollectionItem.java
...classifier/v1/model/ClassifyCollectionOptions.java

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[germanattanasio]

@lpatino10 Great work here! 👍