Add upsampling option to PositionGroup

[samuelbray32]

Description

Resolves #1006
Allows for upsampling position data within PositionGroup. This enables decoding with data from any position pipeline

• adds secondary key upsample_rate to PositionGroup
• adds method PositionGroup._upsample()
• Moves shared functionality of ClusterlessDecodingV1.fetch_position_info() and SortedSpikesGroupV1.fetch_position_info() into new method PositionGroup.fetch_position_info

Checklist:

• no This PR should be accompanied by a release: (yes/no/unsure)
• n/a If release, I have updated the CITATION.cff
• yes This PR makes edits to table definitions: (yes/no)
• If table edits, I have included an alter snippet for release notes.
• n/a If this PR makes changes to position, I ran the relevant tests locally.
• I have updated the CHANGELOG.md with PR number and description.
• I have added/edited docs/notebooks to reflect the changes

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