improve width() performance

[jquast]

Performance improvement for most strings that are longer and contain escape sequences.

The "long loop" is only necessary to measure "cursor extent" for horizontal sequences and control character ('\b') -- we can use performance-optimized version if such sequences are detected as not found.

This does however have a negative effect of measuring VS-16 and ZWJ-related "glitch" sequences, which is no problem, wcwidth makes no guarantees of their measured length, but its worth writing negative test case to verify these conditions in future changes.

[codspeed-hq]

Merging this PR will improve performance by 58.63%

⚡ 7 improved benchmarks
✅ 31 untouched benchmarks

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	test_width_udhr	193.3 ms	138.9 ms	+39.18%
⚡	test_center_udhr_lines	2.5 ms	1.9 ms	+35.61%
⚡	test_width_complex_ansi	83.6 µs	52.7 µs	+58.63%
⚡	test_ljust_udhr_lines	2.4 ms	1.8 ms	+37.83%
⚡	test_strip_sequences_simple	29.7 µs	26.5 µs	+12.31%
⚡	test_wrap_japanese	5.9 ms	5.3 ms	+10.89%
⚡	test_rjust_udhr_lines	2.4 ms	1.8 ms	+37.73%

---

_{Comparing jq/width-improvement (85e8957) with master (7a398cb)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (7a398cb) to head (85e8957).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #181   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           13        13           
  Lines          592       597    +5     
  Branches       142       145    +3     
=========================================
+ Hits           592       597    +5     

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