Search in all past versions of files

[kantord]

At the moment, SeaGOAT is designed to only search in one specific version of a file. This actually leads to problems when for example a chunk is cached for an older version of the file and we are trying to retrieve it from the current version of the file: #226 (That issue can be worked around, but that is an imperfect solution)

Instead, SeaGOAT should be modified as such:

• git hash-object should be used to calculate current versions of the file
• All past versions should be analyzed (with low priority) with their corresponding hash as well
• The ripgrep source should search in all git blobs with their corresponding hash, and later match them to the most appropriate filename
• If a file matches the search in multiple versions, all versions should be returned in the JSON, but in the CLI output only the latest version should be shown