fix: Improve color env variable support

[epage]

• CLICOLOR=1 now works correctly
• NO_COLOR= now works correctly
• Auto-enable colors in CI

For running typos on the Linux kernel (176,210 typos to be printed), we went from 20.082s to <20.450s. Where in that range is unclear due to jitter in my system.

$ hyperfine -L typos ./typos-main,./typos-anstream "{typos} ../../../linux" -i
Benchmark 1: ./typos-main ../../../linux
  Time (mean ± σ):     20.082 s ±  0.111 s    [User: 39.668 s, System: 0.474 s]
  Range (min … max):   19.961 s … 20.331 s    10 runs

  Warning: Ignoring non-zero exit code.

Benchmark 2: ./typos-anstream ../../../linux
  Time (mean ± σ):     20.426 s ±  0.104 s    [User: 40.301 s, System: 0.523 s]
  Range (min … max):   20.316 s … 20.661 s    10 runs

  Warning: Ignoring non-zero exit code.

Summary
  './typos-main ../../../linux' ran
    1.02 ± 0.01 times faster than './typos-anstream ../../../linux'

$ CLICOLOR_FORCE=1 hyperfine -L typos ./typos-anstream "{typos} ../../../linux" -i
Benchmark 1: ./typos-anstream ../../../linux
  Time (mean ± σ):     20.262 s ±  0.075 s    [User: 39.961 s, System: 0.542 s]
  Range (min … max):   20.154 s … 20.420 s    10 runs

  Warning: Ignoring non-zero exit code.

$ CLICOLOR=0 hyperfine -L typos ./typos-anstream "{typos} ../../../linux" -i
Benchmark 1: ./typos-anstream ../../../linux
  Time (mean ± σ):     20.296 s ±  0.065 s    [User: 40.003 s, System: 0.565 s]
  Range (min … max):   20.169 s … 20.383 s    10 runs

  Warning: Ignoring non-zero exit code.