Create tests for examples with custom stages

[dagardner-nv]

Description

This PR creates at least one test for each example containing custom stages.
This PR currently only covers those examples which do not require additional packages.
Part of #849.

• Moves the bert vocabulary files to morpheus/data dir, no longer requiring them to be fetched from LFS and making them available to unittests.
• Fixes type hints and remove a redundant method in examples/log_parsing/inference.py
• Remove redundant copies of bert-base-cased-hash.txt and bert-base-uncased-hash.txt files, replacing them with symlinks to the files in the morpheus/data` dir fixes [FEA]: Remove redundant bert hash files #850
• Explicitly set encoding='UTF-8' in examples/log_parsing/postprocessing.py as a work-around for issue [BUG]: cupy, and by extension cudf changes the system's preferred encoding to ANSI_X3.4-1968 #859
• Add py::kw_only to Python bindings for TensorMemory and sublasses to ensure parity with Python impls.
• Set repr=False for the tensors field of TensorMemory avoids bug when printing due to the fact that we assign the value to self._tensors
• Seed cupy's random number generator in manual_seed method.
• Fix usage of reload_modules fixture, requesting a reload of multiple modules should be done with @pytest.mark.reload_modules([mod1, mod2]) not calling reload_modules twice.
• New test data in tests/tests_data/log_parsing is based upon the first 5 rows of data from models/datasets/validation-data/log-parsing-validation-data-input.csv

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[mdemoret-nv]

A few suggestions:

• Make the tests/examples directory better mirror the examples directory
  • Since there are no python files in the root of examples, there shouldnt be any tests in the root of tests/examples
  • Move any of the tests/examples/test_XXX.py file in the root of tests/examples into a folder to match examples/XXX
  • i.e. tests/examples/test_pass_thru.py -> tests/examples/developer_guide/test_pass_thru.py
• Make the tests/tests_data/examples directory better mirror the examples directory
  • Same as the previous comment. Things like tests/tests_data/examples/abp_pcap.jsonlines should be moved to tests/tests_data/examples/abp_pcap_detection/abp_pcap.jsonlines

[mdemoret-nv]

/merge