Add affinity propagation

[Yuan-Ru-Lin]

This is a companion PR of JuliaAI/MLJClusteringInterface.jl#28.

Without this, ap = @load AffinityPropagation pkg=Clustering wouldn't work.

[ablaom]

Oh, wow. I usually take care of this, but if it works..., thanks.

Other steps someone needs to take are:

• Add a model descriptor for MLJ documentation (the "Model Browser")

• Add to the list of supported models in documenation.

This PR will fail until:

• MLJClusteringInterface tags a new release after Initial commit for implementation of Affinity Propagation MLJClusteringInterface.jl#28 is merged.

[Yuan-Ru-Lin]

• Add a model descriptor for MLJ documentation (the "Model Browser")
• Add to the list of supported models in documenation.

Done in JuliaAI/MLJ.jl#1147.

[ablaom]

@Yuan-Ru-Lin Are you happy to rebase, now I've merged #576.

While you're at it, can you please bump Julia compat to 1.10 and bump change "1.6" in CI.yml to "1.10"?

[ablaom]

And if you're happy for me to merge, please remove the "Draft" tag, thanks.

[Yuan-Ru-Lin]

@ablaom all done!

[DilumAluthge]

@ablaom Is it necessary to drop support for Julia 1.6?

[ablaom]

@ablaom Is it necessary to drop support for Julia 1.6?

Mmm. Not strictly necessary, but this is already happening in the MLJ ecosystem elsewhere. I think, given narrow bandwidth for maintenance, it's hard to justify supporting < LTS. Do you have a specific reason for lamenting the loss of support?