Issue 33870: pdb continue + breakpoint

Please extend pdb's continue to support an optional argument, identical to break.

When debugging I frequently want to quickly run to a certain line number then break. Rather than break / continue / clear (or tbreak / continue), it would be handy to type
(Pdb) cont 99

to run to line 99 as a one-off breakpoint.
Considering the semantics a little more, "cont 99" could be equivalent to

tbreak 99
cont

perhaps with an implicit clear on SIGINT.

This is similar in the simple case to "until 99", except "until" stops on frame boundaries, refuses to go backwards (e.g. in a loop), and doesn't take the full range of filename / lineno / function / condition.