Implement readString

[dsseng]

Closes #606

[kevinkassimo]

Hmm I am also thinking if we should also provide a version that possibly allow multi-char delimiter?

[zekth]

Hmm I am also thinking if we should also provide a version that possibly allow multi-char delimiter?

IMO we need multichar delimiter

[kevinkassimo]

Hmm I am also thinking if we should also provide a version that possibly allow multi-char delimiter?

IMO we need multichar delimiter

On second thought I noticed that since BufReader is implemented in a way strictly compliant with Go’s bufio counterparts, maybe single char restriction is fine here. I do hope though if we can provide another utility for unlimited buffered reader that automatically resize/reallocate the internal buffer which would allow implementation of multi-char delim easier (maybe an extension of deno.Buffer. We have something similar for xeval that recently got moved here)

[ry]

LGTM