Add new `PartitionMethod` for connected components, `ConnectedComponentsPartition`

[halleysfifthinc]

Not an immediate priority for me, but opening to register the idea.

This function returns an vector of index vectors, where each vector is a connected component

Meshes.jl/src/topologies/halfedge.jl

Line 340 in 4965450

function conneccomps(elems::AbstractVector{<:Connectivity})

The Partition takes exactly such a Vector{Vector{Int}}, so adding a new partition method should be straightforward

Meshes.jl/src/partitions.jl

Lines 11 to 15 in 4965450

	struct Partition{O}
	object::O
	subsets::Vector{Vector{Int}}
	metadata::Dict
	end