Feature/fixed width formatter

[jagerber48]

Add formatting utilities to output strings will better controlled lengths as strings.

Until this point sciform has provided functionality to control

• The number of digits to the left of the most significant digit using left_pad options
• The number of digits to the right of the most signficiant digit using round_mode="sig_fig" and ndigits
• The number of digits to the right of the decimal symbol using round_mode="dec_place" and ndigits.

format_to_target_length applies an algorithm that varies the number of significant digits displayed and finds the best formatted result. Results closest to the target length are preferred.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b1a4492) 100.00% compared to head (6f25a71) 99.92%.
Report is 63 commits behind head on main.

❗ Current head 6f25a71 differs from pull request most recent head 2d72008. Consider uploading reports for the commit 2d72008 to get more accurate results

Files	Patch %	Lines
src/sciform/target_length.py	97.22%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #139      +/-   ##
===========================================
- Coverage   100.00%   99.92%   -0.08%     
===========================================
  Files           25       27       +2     
  Lines         1212     1268      +56     
===========================================
+ Hits          1212     1267      +55     
- Misses           0        1       +1     

Flag	Coverage Δ
3.10	99.92% <98.21%> (-0.08%)	⬇️
3.11	99.92% <98.21%> (-0.08%)	⬇️
3.12	99.92% <98.21%> (-0.08%)	⬇️
3.9	99.84% <98.11%> (-0.08%)	⬇️

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