[BUG] Adds option to build.sh to build without cugraphops, updates docs

[rlratzel]

closes #2902
closes #2892

Allows from-source users to build without cugraphops. This will disable the sampling algos that depend on cugraphops, but otherwise cugraph builds normally.

Tested by removing libcugraphops from my environment, ensured the build error described in #2892 was seen, built again with the new option and observed the build succeed.

[rlratzel]

I added the "do not merge" label since I'm seeing errors with a local build using this option without libcugraphops installed (I made a bad assumption above that if cmake completed configuration successfully that the build would work).

/Projects/cugraph/cpp/src/prims/per_v_random_select_transform_outgoing_e.cuh(631): error: name followed by "::" must be a class or namespace name
          detected during:
            instantiation of "std::tuple<std::optional<rmm::device_uvector<size_t>>, decltype((<expression>))> cugraph::per_v_random_select_transform_outgoing_e(const raft::handle_t &, const GraphViewType &, const VertexFrontierBucketType &, EdgeSrcValueInputWrapper, EdgeDstValueInputWrapper, EdgeOp, raft::random::RngState &, size_t, __nv_bool, std::optional<T>, __nv_bool) [with GraphViewType=cugraph::graph_view_t<int32_t, int32_t, float, false, false, void>, VertexFrontierBucketType=cugraph::key_bucket_t<int32_t, void, false, false>, EdgeSrcValueInputWrapper=cugraph::detail::edge_major_property_view_t<int32_t, const int32_t *>, EdgeDstValueInputWrapper=cugraph::detail::edge_minor_property_view_t<int32_t, const int32_t *>, EdgeOp=cugraph::detail::sample_edges_op_t<int32_t, float, int32_t>, T=thrust::tuple<int32_t, int32_t, float, int32_t, int32_t, thrust::null_type, thrust::null_type, thrust::null_type, thrust::null_type, thrust::null_type>]"
/Projects/cugraph/cpp/src/sampling/detail/sampling_utils_impl.cuh(186): here
            instantiation of "std::tuple<rmm::device_uvector<GraphViewType::vertex_type>, rmm::device_uvector<GraphViewType::vertex_type>, std::optional<rmm::device_uvector<GraphViewType::weight_type>>> cugraph::detail::sample_edges(const raft::handle_t &, const GraphViewType &, raft::random::RngState &, const rmm::device_uvector<GraphViewType::vertex_type> &, size_t, __nv_bool) [with GraphViewType=cugraph::graph_view_t<int32_t, int32_t, float, false, false, void>]"
/Projects/cugraph/cpp/src/sampling/detail/sampling_utils_sg.cu(124): here
...

line 631 in that file is:

             cugraph::ops::gnn::graph::INVALID_ID<edge_t>,

cc @ChuckHastings

[codecov-commenter]

Codecov Report

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Additional details and impacted files

@@               Coverage Diff               @@
##             branch-22.12    #2904   +/-   ##
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  Files                   ?      122           
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[BradReesWork]

rerun tests

[rlratzel]

@gpucibot merge