options for format_value() : drop leading 0, minus and plus signs

[strengejacke]

Fixes #711

[codecov-commenter]

Codecov Report

Merging #724 (008bced) into main (baead01) will increase coverage by 0.04%.
The diff coverage is 85.71%.

❗ Current head 008bced differs from pull request most recent head 745df6b. Consider uploading reports for the commit 745df6b to get more accurate results

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@@            Coverage Diff             @@
##             main     #724      +/-   ##
==========================================
+ Coverage   51.77%   51.82%   +0.04%     
==========================================
  Files         125      125              
  Lines       14802    14818      +16     
==========================================
+ Hits         7664     7679      +15     
- Misses       7138     7139       +1     

Impacted Files	Coverage Δ
R/format_number.R	68.29% <66.66%> (ø)
R/format_value.R	72.50% <88.88%> (+3.26%)	⬆️

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[bwiernik]

Awesome thanks!