[ADD] Core functionality added.

[Maverick099]

• dataset class added.
• series class added.
• point class added.
• utils functions added.

[codecov]

Codecov Report

Attention: 42 lines in your changes are missing coverage. Please review.

Comparison is base (64e7ec9) 100.00% compared to head (d9f4685) 20.75%.
Report is 9 commits behind head on main.

Files	Patch %	Lines
lib/src/core/dataset.dart	19.23%	21 Missing ⚠️
lib/src/core/series.dart	0.00%	13 Missing ⚠️
lib/src/core/point.dart	11.11%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              main       #8       +/-   ##
============================================
- Coverage   100.00%   20.75%   -79.25%     
============================================
  Files            1        5        +4     
  Lines            1       53       +52     
============================================
+ Hits             1       11       +10     
- Misses           0       42       +42     

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