Podaac-data-subscriber

Fixed
- Fixed an issue where token-refresh was expecting a dictionary, not a list of tuples
- Fixed issues where token was not propagated to downloader CMR query [94](https://github.com/podaac/data-subscriber/issues/94)
- Fixed an issue with 503 errors on data download not being re-tried. [97](https://github.com/podaac/data-subscriber/issues/9797)
- added ".tiff" to default extensions to address [100](https://github.com/podaac/data-subscriber/issues/100)
- removed erroneous 'warning' message on not downloading all data to close [99](https://github.com/podaac/data-subscriber/issues/99)
- updated help documentation for start/end times to close [79](https://github.com/podaac/data-subscriber/issues/79)
Added
- Added citation file creation when data are downloaded [91](https://github.com/podaac/data-subscriber/issues/91). Required some updates to the regression testing.

Fixed
- Fixed an issue where using a default global bounding box prevented download of data that didn't use the horizontal spatial domain [87](https://github.com/podaac/data-subscriber/issues/87)
- Fixed limit option not being respected. [86](https://github.com/podaac/data-subscriber/issues/86)

Fixed
- Support for SHA-256 and SHA-512 checksums

Changed
- Changed minimum supported python version to 3.7, down from 3.8.

Changed
- Switched to [poetry](https://python-poetry.org/) as the build tool for the project

Added
- check if file exists before downloading a file. [17](https://github.com/podaac/data-subscriber/issues/17)
- added automated regression testing
Changed
- Implemented Search After CMR interface to allow granule listings > 2000 [15](https://github.com/podaac/data-subscriber/issues/15)
- Retry CMR queries on server error using random exponential backoff max 60 seconds and 10 retries
- Refresh token if CMR returns 401 error
- Converted print statements to log statements
Deprecated
Removed
Fixed
Security