Dandi export and read

[samuelbray32]

Description

Partial steps for #861

• Step (3)

  • makes new table DandiPath
    • tracks translations between analysis file name and renamed path in a dandiset
    • has method to stream data from dandi
  • makes function Export.compile_dandiset()
    • Uses dandi api functions to get dandi-compliant names for files
    • organizes and uploads files to dandi
    • populates DandiPath
  • makes admin function Export._prepare_files_for_export()
    • Addresses common discrepancies between dandi standards and metadata in the nwb
    • ensures all analysis files in the export set have unique uuid's #953
    • resolves resulting mismatch between database checksum and altered file

• Step (4)

  • adds new fallback to fetch_nwb which streams file from dandi if available

Checklist:

• [X] This PR should be accompanied by a release: unsure
• [ ] If release, I have updated the CITATION.cff
• [X] This PR makes edits to table definitions: no
• [X] N/A If table edits, I have included an alter snippet for release notes.
• [X] I have updated the CHANGELOG.md with PR number and description.
• [X] I have added/edited docs/notebooks to reflect the changes
• [ ] Change the dandi url's from development to production server