feat: session management for Opal

[ymarcon]

No description provided.

[Copilot]

Pull Request Overview

This PR adds session management functionality to the DSOpal package, implementing support for DataSHIELD Interface (DSI) session operations. The changes enable asynchronous remote R session creation and state monitoring.

• Adds new OpalSession class implementing DSI session management
• Implements session lifecycle methods (dsHasSession, dsSession, dsIsReady, dsStateMessage)
• Updates dependency versions and adds utils package dependency
• Updates examples to demonstrate new session management functionality

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
R/OpalSession.R	New file defining OpalSession class and implementing session state methods
R/OpalConnection.R	Adds session management methods and updates dsConnect to pass "datashield" context
NAMESPACE	Exports new session-related classes and methods
DESCRIPTION	Updates package dependencies (opalr, DSI versions) and adds utils dependency
man/*.Rd	Generated documentation for new session management methods
inst/examples/datashield.R	Updated example demonstrating session management usage
inst/examples/datashield-api.R	Updated example with session lifecycle demonstrations

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