feat: generic types support

[pi0]

• Refactor: Enabled strict type checks and CI tests

Support <T, MT> generics for all exported types. User config defined with InputConfig<MyConfig, MyMeta> can leverage built-in type hints for meta and environments.

New createDefineConfig and DefineConfig are also exposed for making it easier for frameworks exposing their defineXConfig type utils:

const defineMyConfig = createDefineConfig<MyConfig, MyMeta>();

[codecov]

Codecov Report

Merging #64 (40a921e) into main (9df0498) will increase coverage by 0.88%.
The diff coverage is 96.44%.

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
+ Coverage   87.35%   88.23%   +0.88%     
==========================================
  Files           3        4       +1     
  Lines         506      561      +55     
  Branches       64       64              
==========================================
+ Hits          442      495      +53     
- Misses         64       66       +2     

Impacted Files	Coverage Δ
src/dotenv.ts	77.55% <50.00%> (ø)
src/loader.ts	89.76% <98.14%> (-1.55%)	⬇️
src/types.ts	98.14% <98.14%> (ø)
src/index.ts	100.00% <100.00%> (ø)

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