Simplify the definition of a node in the Record & Replay API.
Move the wording around sub-graphs to the sub-graph section,
and use "command" terminology rather than "kernel" to be
more generic.

Actions Gordon's feedback from:
* Lack of clarity over inclusion of queue shortcut functions
intel#5626 (comment)
* Say "command" rather than "kernel"
intel#5626 (comment)

Address [Steffen's
feedback](intel#5626 (comment))
and move the `info::device::graph_support_level` to enum up a namespace
level to `info::graph_support_level`.

Using `info::device::graph_support` to return a `info::graph_support_level` is
analogous with the `info::device::device_type` query in the main
spec which returns a `info::device_type`. Or `info::device::local_mem_type`
which returns a `info::local_mem_type`.

[Review feedback](intel#5626 (comment))
questioned the phrase "graph is currently being recorded to" as to
whether "to" should be "too". I don't think it should be "too", but
rephrasing to "graph is currently recording any queues" avoids any
confusion.

Also updated the contributors to add Maxime and Jaime (who made the
comment).

…hs (3/4) (#10033)

# Backend integration and feature additions for SYCL Graphs
This is the third patch of a series that adds support for an
[experimental command graph
extension](#5626)

A snapshot of the complete work can be seen in draft PR #9375 which has
support all the specification defined ways of
adding nodes and edges to the graph, including both Explicit and Record
& Replay graph construction. The two types of nodes currently
implemented are kernel execution and memcpy commands.

See https://github.com/reble/llvm#implementation-status for the status
of our total work.

## Scope
This third patch focuses on integrating the graphs runtime with the
backend support added in #9992 as well as any remaining runtime features
and bug fixes, and should include no ABI-breaking changes:
* Graphs runtime changes to use PI/UR command-buffers.
* Various improvements to the Graphs runtime classes.
* New memory manager methods for appending copies to a command-buffer.
* Changes to the Scheduler and related CG classes to enable Graphs.
* Device info query for command-graph support.
* Minor changes to some runtime classes to enable Graphs.

## Following Split PRs
Future follow-up PRs with the remainder of our work on the extension
will include:
* Add end-to-end tests for SYCL Graph extension. (4/4)
* NFC changes - Design doc and codeowner update.

## Authors
Co-authored-by: Pablo Reble <pablo.reble@intel.com>
Co-authored-by: Julian Miller <julian.miller@intel.com>
Co-authored-by: Ben Tracy <ben.tracy@codeplay.com>
Co-authored-by: Ewan Crawford <ewan@codeplay.com>
Co-authored-by: Maxime France-Pillois
<maxime.francepillois@codeplay.com>