[CLIENT-5049] Convert existing code examples in examples/ folder to inherit from a base class for boilerplate setup

[juliannguyen4]

This is preparation for the aerospike.com documentation to reuse examples from examples/client.

CI/CD: Validate all code examples in examples/client

Notes

Code examples will be tweaked later on once they are included in the aerospike.com docs, so they may not be in a final state.

Extra changes

Remove the outdated async examples

Risks

Code examples can no longer take in parameters, so users must manually tweak the examples before running them.

TODO

• ttl.py needs addressing
• aggregate.py

Out of scope

• Verification of code example expected outputs (spoke with Justin)
• Running run_all_examples fails if not run from repo root directory

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.39%. Comparing base (57cbf26) to head (e145b77).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1149      +/-   ##
==========================================
- Coverage   85.39%   85.39%   -0.01%     
==========================================
  Files         101      101              
  Lines       14615    14614       -1     
==========================================
- Hits        12480    12479       -1     
  Misses       2135     2135              

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