Introduce a new stream module to radicle::cob. The purpose of this module is to provide an API for iterating over a COB’s actions, given a range of commits.

The CobStream trait provides the generic API for implementing and using, while Stream provides a concrete implementation using the git2 crate.

Changes:

• Add TypeName for filtering iteration for the given COB – avoids trying to incorrectly deserialize an identity COB action
• Rename CobHistory to CobRange
• The revwalk range can take a glob, so we use PatternString to define all the remote tips for the COB as the end point of the walk
• Add specialised stream types for our native COBs
• Add rad cob actions subcommand

Changes:

• Stream is for Ops and not Actions
• Add helper for inspecting the Manifest of an Entry without loading the whole Entry

Changes:

• Ensure alphanumeric returns a String of length size

Rebased

Remove rad cob ops

Changes:

• Rebased
• Tidied up error module

Changes:

• Removed old file that stuck around during conflict resolution
• Made wording more clear in operations example