Update examples to execute from the root of the repo

[dagardner-nv]

Description

• Update top-level examples and Triton start-up commands to execute from the root of the repo
• Where possible set default values for cli flags, removing the need to set them for the common use-case
• Where possible remove the need for defining MORPHEUS_ROOT
• Ensure C++ Triton pipelines use port 8000 to avoid the warning about the grpc port.
• Optionally cast types in the C++ impl of the Triton stage when force_convert_inputs=true and the input and model types didn't match (previously types were always casted)
• Remove --num_threads=1 restriction and configure logging for the log_parsing example
• Remove --num_threads=8 restriction from nlp_si_detection since the pipeline has more than 8 stages.
• Don't invoke the C++ impl of preallocate if the type being requested isn't supported on the C++ side (strings)
• Don't use the C++ impl of the Triton stage if use_shared_memory is requested as this isn't supported in C++.
• Add missing gnn-fraud-classification stage to CLI alternative for gnn_fraud_detection_pipeline example

Closes #1671

By Submitting this PR I confirm:

• I am familiar with the Contributing Guidelines.
• When the PR is ready for review, new or existing tests cover these changes.
• When the PR is ready for review, the documentation is up to date with these changes.

[mdemoret-nv]

Instead of removing the --force_convert_inputs lets pass the variable down and check if its needed. If they dont match, either throw an exception or pass to triton unchanged. Follow the python implementation.

[dagardner-nv]

/merge