Refactor actuator middleware (separation of concerns)

[bart-vmware]

Description

Refactor actuator middleware: move parsing of request (body) into separate virtual method, so that handler invocation is agnostic of HttpContext.

EndpointMiddleware.InvokeEndpointHandlerAsync used to take an HttpContext parameter, which has changed to TRequest. The newly added method ParseRequestAsync takes HttpContext as input and returns a TRequest.

The public API diff is minimal; this is mostly about aligning internals for a better separation of concerns.

Additionally, this PR includes several commits regarding naming consistency that I've found while documenting public API changes.

Quality checklist

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[TimHess]

LGTM

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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