Do not read files greater than maxFileSize which is currently 4mb

[sheetalkamat]

Fixes #24762

@mjbvz

• should we be sending you event for largeFile so you can show some kind of dialog?
• Can you block sending open request to use if its a large file. Currently with this change vscode works well when i have import to "solc" module but if i click on solcjson.js file from node_modules/solc/ folder things will go bad because we arent reading contents from file but its passed by vscode.

[mjbvz]

Yes you send us an event, we can stop sending updates for these large files. Should we check the file size on our side before opening the file in the first place as well?

[sheetalkamat]

@mjbvz Will create PR for event about large file in separate PR. Yes the large files shouldnt be sent to tsserver in open request at all.