Fix: Fully, nested, and semi string type commnets get ignored.

[hadialqattan]

Examples:

from typing import List
from ast import Import

foo = [Import(...)]  # type: List['Import']
bar = [Import(...)]  # type: "List['Import']"
baz = [Import(...)]  # type: "List[Import]"

[codeclimate]

Code Climate has analyzed commit 1724020 and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Merging #156 (1724020) into master (907b865) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #156   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           28        28           
  Lines         2850      2850           
=========================================
  Hits          2850      2850           

Impacted Files	Coverage Δ
tests/test_scan.py	100.00% <ø> (ø)
pycln/utils/scan.py	100.00% <100.00%> (ø)