Implement pre-execution handlers

[KubaZ2]

Fixes #290

[github-actions]

The documentation preview is available at https://preview.netcord.dev/296.

[Copilot]

Pull request overview

This PR implements pre-execution handlers for all command/interaction handler types in NetCord.Hosting.Services, addressing issue #290 (pre and post-execution events). It introduces a PreExecutionResult discriminated union and corresponding handler interfaces/defaults, allowing users to intercept and optionally abort command/interaction execution.

Changes:

• New PreExecutionResult hierarchy (ContinuePreExecutionResult, SkipPreExecutionResult) enabling return-type-driven flow control from pre-execution handlers.
• Interfaces and default implementations for pre-execution handlers across all four handler types: application commands, autocomplete interactions, component interactions, and text commands.
• Integration of the pre-execution handlers into all four existing handler execution paths, including exception handling and early exit on Skip.

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
CommandPreExecutionResult.cs	Defines the closed PreExecutionResult type hierarchy (Continue/Skip)
ApplicationCommands/IApplicationCommandPreExecutionHandler.cs	New interface for application command pre-execution
ApplicationCommands/ApplicationCommandPreExecutionHandler.cs	Default implementation: logs command name, returns Continue
ApplicationCommands/IAutocompleteInteractionPreExecutionHandler.cs	New interface for autocomplete pre-execution
ApplicationCommands/AutocompleteInteractionPreExecutionHandler.cs	Default implementation: logs autocomplete command name, returns Continue
ApplicationCommands/ApplicationCommandServiceOptions.cs	Adds PreExecutionHandler and AutocompletePreExecutionHandler options
ApplicationCommands/ApplicationCommandInteractionHandler.cs	Integrates pre-execution handler into the app command execution path
ApplicationCommands/AutocompleteInteractionHandler.cs	Integrates pre-execution handler into the autocomplete execution path
Commands/ICommandPreExecutionHandler.cs	New interface for text command pre-execution
Commands/CommandPreExecutionHandler.cs	Default implementation: logs message content, returns Continue
Commands/CommandServiceOptions.cs	Adds PreExecutionHandler option
Commands/CommandHandler.cs	Integrates pre-execution handler into the text command execution path
ComponentInteractions/ICommandPreExecutionHandler.cs	Misnamed file – contains IComponentInteractionPreExecutionHandler<TContext> (should be IComponentInteractionPreExecutionHandler.cs)
ComponentInteractions/ComponentInteractionPreExecutionHandler.cs	Default implementation: logs custom ID, returns Continue
ComponentInteractions/ComponentInteractionServiceOptions.cs	Adds PreExecutionHandler option
ComponentInteractions/ComponentInteractionHandler.cs	Integrates pre-execution handler into the component interaction execution path

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Pull request overview

Copilot reviewed 16 out of 16 changed files in this pull request and generated 1 comment.

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Pull request overview

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