Add support for URI handling

[fioan89]

Description
Toolbox supports URLs in the format:

jetbrains://gateway/<plugin-id>/<anything>

where:

• <plugin-id> corresponds to the plugin’s ID as specified in the plugin's JSON configuration.
• <anything> represents any plugin-specific components, including path, query parameters, and fragments.

Currently, the Coder Toolbox plugin needs improved handling for these URIs to ensure a seamless connection and workspace management experience.

Expected Behavior
When opening a URI, the Coder Toolbox plugin should:

• Connect and authenticate with the specified Coder deployment.
• Retrieve the list of available workspaces from the deployment.
• Cross-match the retrieved workspaces with the workspace provided in the URI.
• Navigate to the associated environment page for the matched workspace.
• Install the specified IDE (if not already installed).
• Launch the IDE and open the corresponding project within the remote workspace.

Additional Notes
The plugin should ensure that Toolbox has completed its initialization before executing any URI-related operations to prevent premature polling jobs.

Proper error handling and user feedback should be implemented for cases where authentication fails, the workspace is not found, or the requested IDE is unavailable.