style: move using directive to top

[nogic1008]

• declare to use file-scoped namespace on .editorconfig (to dismiss IDE0160)
• move using directive to top (to fix IDE0065)
• remove unused using directive (to fix CS8019)

[commit-lint]

Styles

• use file-scoped namespace (fdf3a4e)
• move using directive to top (42add8d)
• remove unused using (46a6897)

Contributors

nogic1008

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[codecov]

Codecov Report

Merging #68 (46a6897) into main (f97dc72) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #68   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines           63        63           
  Branches         7         7           
=========================================
  Hits            63        63           

Flag	Coverage Δ
Linux	100.00% <ø> (ø)
Windows	100.00% <ø> (ø)
macOS	100.00% <ø> (ø)
net6.0	100.00% <ø> (ø)
netcoreapp3.1	100.00% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Nogic.WritableOptions/JsonWritableOptions.cs	100.00% <ø> (ø)
...ogic.WritableOptions/ServiceCollectionExtension.cs	100.00% <ø> (ø)

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