discv5: Add another`TalkReq` function with `Context` arg

[GrapeBaBa]

Rationale

Follow the Go network library design practice, add one more TalkReq function with context arg is more useful for some use-cases which wanna to return immediately without waiting the response anymore by some condition.

For example: https://pkg.go.dev/net/http#NewRequestWithContext

Implementation

We already added in our fork and would like to submit to the upstream.

[rose2221]

would like to work on it!

[MariusVanDerWijden]

@GrapeBaBa do you have a link to your implementation?

[GrapeBaBa]

@MariusVanDerWijden Sorry we revert this change since we don't use this way any more, I can close this issue if no use case for this issue.