tealdbg: large program breaks cdt session

[barnjamin]

When using tealdbg if the disassembled teal is over a given size and the source is requested the CDT session will be disconnected

I believe this is related to the buffer sizes set here:

https://github.com/algorand/go-algorand/blob/master/cmd/tealdbg/server.go#L34-L35

To test I overwrote those values with 60k and started the sandbox with the fork and re-ran the tealdbg command. With these changes the TEAL loaded successfully.

[cusma]

@barnjamin this is super useful! It took me some time without success to understand what was going on.