Output link predictions as SSSOM

[caufieldjh]

The existing output for predicted links looks like this:

source_node	destination_node	score
ENSP00000451575	ENSP00000435370	0.9370759965425138
ENSP00000451575	ENSP00000435370	0.9370759965425138
ENSP00000451575	ENSP00000361636	0.9361207132288921
ENSP00000451575	ENSP00000361636	0.9361207132288921
ENSP00000451575	ENSP00000357879	0.9361171909487621

The corresponding columns in SSSOM are subject_id, object_id, and confidence.
We can change the column heading and already be compliant.

It would be best to include some provenance as well, though - a string can go in additional columns, mapping_tool and mapping_tool_version.
We have a few different things to keep track of here:

• neat-ml version
• grape version
• contents of specific neat config
  So this may not capture the entirety of the mapping, but it can be a frame of reference.

[caufieldjh]

Could represent neat config full text as hash, then include in SSSOM output (don't forget docs on where to find the hash function)