ci: Test the library with rust stable, nightly and msrv

[Mcdostone]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3abf6f4) 100.00% compared to head (0fe61cb) 100.00%.
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #14   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           32        31    -1     
  Lines          240       287   +47     
=========================================
+ Hits           240       287   +47     

Files	Coverage Δ
src/attribute/default.rs	100.00% <100.00%> (ø)
src/attribute/depends_on.rs	100.00% <ø> (ø)
src/attribute/expression.rs	100.00% <100.00%> (ø)
src/attribute/imply.rs	100.00% <100.00%> (ø)
src/attribute/mod.rs	100.00% <100.00%> (ø)
src/attribute/modules.rs	100.00% <ø> (ø)
src/attribute/option.rs	100.00% <100.00%> (ø)
src/attribute/optional.rs	100.00% <ø> (ø)
src/attribute/prompt.rs	100.00% <100.00%> (ø)
src/attribute/range.rs	100.00% <100.00%> (ø)
... and 11 more

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[github-actions]

Benchmark for 63374d8

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Test	Base	PR	%
parse_kconfig	1871.4±59.43ns	1932.6±68.09ns	+3.27%
parse_kconfig_1_config_entry	1879.6±69.35ns	1965.9±80.52ns	+4.59%
parse_kconfig_lot_of_sources	1875.4±62.96ns	1934.9±159.54ns	+3.17%