Remove non-alphanumeric characters from workflow names and output entities

[tsalo]

Closes #295.

Changes proposed:

• Use regular expressions to remove non-alphanumeric characters from the B0FieldIdentifier used in workflow names and output entities.

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 76.41%. Comparing base (2456489) to head (a18cdb2).

Files	Patch %	Lines
sdcflows/workflows/fit/base.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #434      +/-   ##
==========================================
- Coverage   76.43%   76.41%   -0.03%     
==========================================
  Files          32       32              
  Lines        2835     2841       +6     
  Branches      376      376              
==========================================
+ Hits         2167     2171       +4     
- Misses        600      602       +2     
  Partials       68       68              

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[mgxd]

This is causing an error upstream:

Traceback (most recent call last):
  File "/opt/conda/envs/nibabies/bin/nibabies", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/opt/conda/envs/nibabies/lib/python3.11/site-packages/nibabies/cli/run.py", line 61, in main
    retval = build_workflow(config_file)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/nibabies/lib/python3.11/site-packages/nibabies/cli/workflow.py", line 76, in build_workflow
    retval['workflow'] = init_nibabies_wf(config.execution.unique_labels)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/nibabies/lib/python3.11/site-packages/nibabies/workflows/base.py", line 146, in init_nibabies_wf
    single_subject_wf = init_single_subject_wf(
                        ^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/nibabies/lib/python3.11/site-packages/nibabies/workflows/base.py", line 589, in init_single_subject_wf
    wf_inputs = getattr(fmap_wf.inputs, f'in_{estimator.bids_id}')
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'TraitedSpec' object has no attribute 'in_auto_00000'

We probably want to either change estimator.bids_id to ensure it is cleaned, or add a new attribute to easily access the cleaned id.

[effigies]

Let's revert. We can rethink this.

[effigies]

Reverted. What if we replace all non-alphanumeric characters with underscores?

[mgxd]

Removing or replacing both sound reasonable - it's just the sanitized id needs to be available within the FieldmapEstimation class so we can easily index the workflow inputs.