[CLIENT-3947] Deprecate meta["ttl"] parameter in favor of setting ttl as a policy option instead

[juliannguyen4]

This affects all the aerospike.Client methods that accept a metadata dictionary parameter:

• append()
• increment()
• operate()
• operate_ordered()
• prepend()
• put()
• remove()
• remove_bin()
• touch()

As well as BatchRecords Write and Read.

Extra Changes

• validate_keys: allow "read_mode_ap", "max_threads", and "thread_pool_size" as valid keys in the client config dictionary
• Fix test that checks if a valid client config option raises a ParamError

Documentation

• https://aerospike-python-client--880.org.readthedocs.build/en/880/aerospike_helpers.batch.html#aerospike_helpers.batch.records.Read
• https://aerospike-python-client--880.org.readthedocs.build/en/880/aerospike_helpers.batch.html#aerospike_helpers.batch.records.Write
• https://aerospike-python-client--880.org.readthedocs.build/en/880/client.html

TODO

• Update code examples that use meta parameter

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.96%. Comparing base (b3a3aa4) to head (1a8f297).
⚠️ Report is 7 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #880      +/-   ##
==========================================
+ Coverage   83.53%   83.96%   +0.42%     
==========================================
  Files          99       99              
  Lines       14392    14409      +17     
==========================================
+ Hits        12022    12098      +76     
+ Misses       2370     2311      -59     

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