Support peer access DPC++ extension

[ndgrigorian]

This PR adds full support for the DPC++ sycl_ext_oneapi_peer_access extension

This adds a Python interface to calls that check if a dpctl.SyclDevice can enable peer access to another dpctl.SyclDevice and, if so, to enable or disable it.

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[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

[github-actions]

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_194 ran successfully.
Passed: 1109
Failed: 3
Skipped: 119

[coveralls]

coverage: 84.961% (-0.7%) from 85.626%
when pulling 7317df9 on feature/support-peer-access-extension
into 8718814 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_194 ran successfully.
Passed: 1109
Failed: 3
Skipped: 119

[github-actions]

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_199 ran successfully.
Passed: 1107
Failed: 5
Skipped: 119

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Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_200 ran successfully.
Passed: 1109
Failed: 3
Skipped: 119

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Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_201 ran successfully.
Passed: 1108
Failed: 4
Skipped: 119

[ndgrigorian]

Noting here that for future reference, we will probably need to document how this extension interacts with sub-devices and composite devices.

For example, per composite device documentation

Interaction with the default context

If the implementation supports the sycl_ext_oneapi_default_context extension, then each platform has the notion of a default context.
This default context contains only the platform’s root devices, which are those returned by platform::get_devices.
Any composite devices for the platform are not considered root devices, and thus the default context does not include these composite devices.
If an application wants a context that contains the composite devices, then it must explicitly create such a context.

this means that while the peer access methods will work between composite device and its component devices, and vice versa, to actually leverage it, the user needs to explicitly construct a context containing component and composite devices.

[github-actions]

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_203 ran successfully.
Passed: 1105
Failed: 7
Skipped: 119

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Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_213 ran successfully.
Passed: 1113
Failed: 6
Skipped: 119

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Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_216 ran successfully.
Passed: 1113
Failed: 6
Skipped: 119

[antonwolfy]

Thank you @ndgrigorian, no more comments from me

[github-actions]

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_220 ran successfully.
Passed: 1114
Failed: 5
Skipped: 119

[ndgrigorian]

@antonwolfy
made one more quick round of changes—combined the can_access_peer methods into one since extension defaults to access_supported anyway. This seems more convenient for users.

Take a look, it should have overall small impact on the implementation.

[github-actions]

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_220 ran successfully.
Passed: 1111
Failed: 8
Skipped: 119

[github-actions]

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_221 ran successfully.
Passed: 1114
Failed: 5
Skipped: 119

[github-actions]

Array API standard conformance tests for dpctl=0.20.0dev0=py310h93fe807_222 ran successfully.
Passed: 1113
Failed: 6
Skipped: 119

[antonwolfy]

In overall LGTM, few small comments which might be address separately.

[ndgrigorian]

Addressing other comments in follow-up