feat: allow wildcards in StrCat list indexing

[andrzejnovak]

For a demo hist like

import hist
import numpy as np
import string

h = hist.new.Reg(10, 0, 10).StrCat([], growth=True).Weight()
N = 100000
for cat in ["ABC", "BCD", "CDE", "DEF"]:
    h.fill(
        np.random.normal(np.random.uniform(0, 10), 1, N), cat
    )
h.plot2d()

This allows slicing like

h[:, "*E*"]

and

h[:, ["*B*", "?D?"]]