feat: Set process buffer limit from ProcessLaunchInfo

[shplack]

The default buffer limit for subprocess streams are 64kb. Requesting a large document could result in a larger response, raising an asyncio.exceptions.LimitOverrunError.

Set the subprocess limit from LanguageServerHandler.process_launch_info to allow overriding this limit when expecting larger responses.

For example:

lsp = LanguageServer(...)
lsp.server.process_launch_info.limit = 1024 * 64 * 2