Removed .ini file usage, changed data_types for `--add-extra-file-info`

[esimpsons3ti]

1. Configuration Files

• INI format is no longer required for configuration files. YAML is the new standard. Functions parsing and using the configuration file contents have been changed to use this new format.
• --config-file can now use multiple configuration files by being invoked multiple times in the query:

  pds4_create_xml_index . "**/**/*.xml" --config-file config_1.yaml --generate-label ancillary --config-file label_config.yaml

• --label-user-input has been removed, now that --config-file has expanded functionality.
• Documentation for --label-user-input has been removed.
• Documentation for --config-file has been updated.
• Unit tests for the configuration files have been updated.

2. Data Types Update

• The data types for filename and filepath have been updated. filename now has the pds:ASCII_File_Name data type. filepath now has the pds:ASCII_File_Specification_Name data type if the value is less than or equal to 255 characters. If it is longer, an error message is printed and the program exits.

Fixes #24

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 61.53846% with 10 lines in your changes missing coverage. Please review.

Project coverage is 70.96%. Comparing base (9d43247) to head (6d9e537).

Files	Patch %	Lines
pds4indextools/pds4_create_xml_index.py	61.53%	6 Missing and 4 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #31 +/- ## ========================================== - Coverage 71.20% 70.96% -0.25% ========================================== Files 1 1 Lines 587 589 +2 Branches 134 137 +3 ========================================== Hits 418 418 + Misses 144 143 -1 - Partials 25 28 +3 ```

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[esimpsons3ti]

@rfrenchseti I approve of your changes. Feel free to squash and merge.