Add option to ignore high entropy strings (like secrets)

[boris-smidt-klarrio]

Dear,

We really like the typos tool its amazingly fast.

In our repo we have some encrypted strings and this gives the several false positives hits.
It might be useful to have a check to see how high the entropy is and then not to alert in that case.

for input:

# error: `Ue` should be `Use`, `Due`
9ywSLxirUeYg4NgXtO
# error: `abd` should be `and`
s-abd34f18avb514f9ac

In these cases i would expect it to detect that the string has a high entropy and it would skip reporting it.

[epage]

I believe this is a duplicate of #484. If there is a reason we should keep this open separately, let us know!