Pull from a github folder

[yann300]

fix https://github.com/ethereum/remix-project/issues/4345

Some issues still remains:

• ~~it still need a gh token otherwise it quickly reach the api rate limit.~~
• ~~it actually add the current folder in remix. eg for https://github.com/yann300/ethereumjs-vm/tree/master/examples , it creates the examples folder.~~
• ~~it puts everything under the code-sample workspace.~~ => not an issue as it seems

You may try by adding the url param ghfolder=https://github.com/ethereum/remix-project/tree/master/apps/remix-ide/contracts/hardhat

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[ioedeveloper]

I passed in 2 url params for 'code-sample' (ghfolder and code) at the same time to test, and a workspace was created with the content of the github folder and also the code file that was imported, all together in the same workspace. I don't know if this was the expected behaviour, but it was interesting to see.

[ryestew]

I just tried it on Chrome and the code-sample folder was created but nothing was in it. I tried it with both this url: https://deploy-preview-4739--remixproject.netlify.app/#lang=en&ghfolder=https://github.com/pcaversaccio/snekmate/tree/main/src/snekmate/tokens and https://deploy-preview-4739--remixproject.netlify.app/#lang=en&ghfolder=ghfolder=https://github.com/ethereum/remix-project/tree/master/apps/remix-ide/contracts/hardhat

Then I tried it on Firefox and it worked. Then I tried it again on chrome and it worked. My connection is a bit slow here. A few weeks back this PR was not working at all for me. Now it is improved.