[feature request] Update process metrics semantic conventions

[martincostello]

Component

OpenTelemetry.Instrumentation.Process

Is your feature request related to a problem?

While working on #4088 I noticed that the process instrumentation was implemented against v1.25.0 of the semantic conventions, but the latest is v1.40.0 v1.42.0 which contains some changes.

What is the expected behavior?

Update to v1.42.0 of the semantic conventions (or whatever version is the latest when this is picked up).

Non-exhaustive changes between v1.25.0 and v1.42.0 include:

• process attributes moving to release candidate
  • Stabilise cpu.mode attribute semantic-conventions#3694
  • Stabilize the process namespace semantic-conventions#3041
• process.cpu.state was renamed to cpu.mode

Any recommended metrics that are easy to implement that are absent should also be added.

Which alternative solutions or features have you considered?

None.

Additional context

No response

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