Make latex image depth factor in name length (#2840)
Make latex image depth factor in name length (#2840)

The latex circuit drawer previously was not factoring in the length of
the register name when factoring how deep (ie how wide each column is)
to make the output page from compiling the output visualization. Instead
it was assuming a fixed width for ensuring there was enough space for
the register names. This clearly doesn't work when there is a very long
name in use. To correct this this commit loops over the register names
and adds spacing based on the number of characters in the register name
ensuring that the output page is wide enough to include the circuit with
the full register name

Fixes #2780
QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py