Allow AbstractPlugin to handle $/progress notification

[jfcherng]

Description

Similar to #2493 but this time is asking for $/progress notification, whose payload is more structured than window/logMessage.

Currently $/progress notification is handled by LSP automatically at

LSP/plugin/core/sessions.py

Line 2177 in f512c96

def m___progress(self, params: ProgressParams) -> None:

and not propagated to the client (LSP-copilot in our case).

Use Case

While implementing LSP-copilot's chat (or say "conversation" in its official term) feature,

• We asked Am I working in Sublime Text?.
• Eventually, the server answered No, you are working in an IDE called vscode. in a $/progress notification.

However, all responses from the copilot.vim server in this conversation are $/progress. Currently, there is no way for a client to handle any of them and hence LSP-copilot can't get the answer from the server.

Communication Payloads

:: [15:00:05.997] --> LSP-copilot conversation/turn (8): {'conversationId': 'f4302595-dbbe-4411-9d82-e2367aa74217', 'message': 'Am I working in Sublime Text?', 'workDoneToken': '5'}
:: [15:00:06.011] <-  LSP-copilot $/progress: {'token': '5', 'value': {'kind': 'begin', 'title': 'Conversation f4302595-dbbe-4411-9d82-e2367aa74217 Turn e462ef0d-09c8-4e66-bb5e-5cf5fc0d99d7', 'conversationId': 'f4302595-dbbe-4411-9d82-e2367aa74217', 'turnId': 'e462ef0d-09c8-4e66-bb5e-5cf5fc0d99d7'}}
:: [15:00:06.011] <-  LSP-copilot $/progress: {'token': '5', 'value': {'kind': 'report', 'conversationId': 'f4302595-dbbe-4411-9d82-e2367aa74217', 'turnId': 'e462ef0d-09c8-4e66-bb5e-5cf5fc0d99d7', 'steps': [{'id': 'collect-context', 'title': 'Collecting context', 'status': 'running'}]}}
:: [15:00:06.521] <-  LSP-copilot $/progress: {'token': '5', 'value': {'kind': 'report', 'conversationId': 'f4302595-dbbe-4411-9d82-e2367aa74217', 'turnId': 'e462ef0d-09c8-4e66-bb5e-5cf5fc0d99d7', 'steps': [{'id': 'recent-files', 'title': 'Resolving recent files', 'status': 'completed'}]}}
:: [15:00:06.521] <-  LSP-copilot $/progress: {'token': '5', 'value': {'kind': 'report', 'conversationId': 'f4302595-dbbe-4411-9d82-e2367aa74217', 'turnId': 'e462ef0d-09c8-4e66-bb5e-5cf5fc0d99d7', 'steps': [{'id': 'collect-context', 'title': 'Collecting context', 'status': 'completed'}]}}
:: [15:00:06.521] <-  LSP-copilot $/progress: {'token': '5', 'value': {'kind': 'report', 'conversationId': 'f4302595-dbbe-4411-9d82-e2367aa74217', 'turnId': 'e462ef0d-09c8-4e66-bb5e-5cf5fc0d99d7', 'steps': [{'id': 'generate-response', 'title': 'Generating response', 'status': 'running'}]}}
:: [15:00:08.287] <-  LSP-copilot $/progress: {'token': '5', 'value': {'kind': 'report', 'conversationId': 'f4302595-dbbe-4411-9d82-e2367aa74217', 'turnId': 'e462ef0d-09c8-4e66-bb5e-5cf5fc0d99d7', 'reply': 'No, you are working in an IDE called vscode.', 'annotations': [], 'hideText': False}}
:: [15:00:09.233] <-  LSP-copilot $/progress: {'token': '5', 'value': {'kind': 'report', 'conversationId': 'f4302595-dbbe-4411-9d82-e2367aa74217', 'turnId': 'e462ef0d-09c8-4e66-bb5e-5cf5fc0d99d7', 'steps': [{'id': 'generate-response', 'title': 'Generating response', 'status': 'completed'}]}}
:: [15:00:09.233] <-  LSP-copilot $/progress: {'token': '5', 'value': {'kind': 'end', 'conversationId': 'f4302595-dbbe-4411-9d82-e2367aa74217', 'turnId': 'e462ef0d-09c8-4e66-bb5e-5cf5fc0d99d7', 'followUp': {'message': 'What are the main features of vscode?', 'id': '1eb5f524-4be6-4061-a2a8-029e94bcc00a', 'type': 'Follow-up from model'}, 'suggestedTitle': 'IDE Comparison: Sublime Text vs vscode', 'skillResolutions': [{'skillId': 'recent-files', 'resolution': 'unresolvable', 'labels': [], 'files': [], 'resolutionTimeMs': 12}, {'skillId': 'project-labels', 'resolution': 'unresolvable', 'labels': [], 'files': [], 'resolutionTimeMs': 14}, {'skillId': 'references', 'resolution': 'unresolvable', 'labels': [], 'files': [], 'resolutionTimeMs': 0}, {'skillId': 'current-editor', 'resolution': 'unresolvable', 'labels': [], 'files': [], 'resolutionTimeMs': 1}], 'updatedDocuments': []}}

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C.c., @TerminalFi