ISO XML Measured Parameter Section Further Enhancements

Description

Moved inline Measured Parameters Config (MPC) schema into a dedicated file src/opera/pge/base/schema/iso_metadata_measured_parameters_config_schema.yaml
Added fields to MPC schema:
- attribute_type: The parameter's EOS AdditionalAttributeDataTypeCode (info) [REQUIRED]
- Must be one of: geographicIdentifier, qualityInformation, instrumentInformation, sensorInformation, contentInformation, platformInformation, citation.identifier, descriptiveKeyword, processingInformation, processingParameter, or commandLineArgument
- display_name: Override for parameter's display name that is normally derived from the metadata variable name. [OPTIONAL]
- attribute_data_type: Override for parameter's data type that is normally guessed from metadata variable's Python type. (info) [OPTIONAL]
- Must be one of: string, float, int, boolean, date, time, dateTime, dateString, timeString, or dateTimeString
Updated DSWx-S1 PGE to use the new MPC fields to populate the ISO XML template, falling back to guesses for absent, non-required fields.

Manually ran unit tests, injecting a copy statement to pull out the temporary ISO XML files for diffing.
```
# in test_dswx_s1_pge.py @ line 290
shutil.copy(expected_iso_metadata_file, '/tmp/.')
```
Ran int test on dev-pge, checking the produced XML files