phdigitalshadows: adding requirements.txt and building wheels

[splunk-soar-connectors-bot]

PAPP-20799: added requirements.txt and wheels

Note:

• I tried, unsuccessfully, to find the correct dsapi in pypi and GitHub, so I could replace that folder with a wheel.
• I don't see anything obviously risky with keeping that folder as-is

Testing:

• workflow actions for this PR are not green, but I think the failure is acceptable:
  • The failure is: JSON config param ds_api_key should probably be of data_type password or file
  • The author seems to have been thoughtful enough to use "data_type": "password" for ds_api_secret_key. It doesn’t feel like it was an accident to use "data_type": "string" for ds_api_key right above it
• built and installed a tarball in this SOAR cloud instance (version 5.1.0.68293)
• also installed tarball in this SOAR on-prem instance (version 5.1.0.68966) confirmed that /opt/phantom/apps/digitalshadows_8cebdfd7-afe9-48eb-b840-2d98f860ed79/dependencies/ contains at least all the items from wheels

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[yashwanth-metron]

Config param ds_api_key data_type is assigned String intentionally, do we need to make any changes?