Refactor the cloudStream to pass-through the request instead of parsing the web path

[fisherxu]

What would you like to be added/modified:
Edgestream is used to handle the request from apiserver, then forward the request to edged through tunnel. Now in edgestream, we parse the url path as here: https://github.com/kubeedge/kubeedge/blob/master/cloud/pkg/cloudstream/streamserver.go#L52

We need to find a way to pass-through the request, through the hijack stuff, instead of parsing the web path manually.

[rajibmitra]

could you please assign this to me @fisherxu

[cbl315]

/assign

Let me try.

[stale]

Hello 👋 Looks like there was no activity on this issue for last 90 days.
Do you mind updating us on the status? Is this still reproducible or needed? If yes, just comment on this PR or push a commit. Thanks! 🤗
If there will be no activity for 60 days, this issue will be closed (we can always reopen an issue if we need!).

[cbl315]

Latest status: not work with this but might be free to try in the next month. So keep it unstale.

[avyamsh]

/assign

[stale]

Hello 👋 Looks like there was no activity on this issue for last 90 days.
Do you mind updating us on the status? Is this still reproducible or needed? If yes, just comment on this PR or push a commit. Thanks! 🤗
If there will be no activity for 60 days, this issue will be closed (we can always reopen an issue if we need!).

[stale]

Closing for now as there was no activity for last 60 days after marked as stale, let us know if you need this to be reopened! 🤗