Validate at runt-time that all required io_uring features are available, else disable the io_uring driver

Support for `io_uring` was added in https://github.com/bloomberg/ntf-core/pull/24. The implementation detects, at run-time, whether the Linux kernel of the current machine supports `io_uring`, and if not, the driver is disabled. This run-time validation should be extended to probe `io_uring` to detects more of the kernel's capabilities and verify that each one (e.g. support for the "sendmsg" operation) is supported before the driver determines itself to be available.

Start by reviewing the existing io_uring runtime validation added in pull request #24 and identify how the driver decides it is available. Extend the probe to cover each required kernel capability, including sendmsg, and verify that the driver is disabled when any required operation is unsupported.

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