Migrated to napari plugin engine version 0.2.0

[Chris-N-K]

No major issues during migration.
Removed the napari_experimental_provide_dock_widget function and coresponding tests.
Updated requirements and setup.cfg to current state.

[codecov-commenter]

Codecov Report

Merging #8 (bde31d0) into main (21da60d) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #8   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            4         3    -1     
  Lines          218       208   -10     
=========================================
- Hits           218       208   -10     

Impacted Files	Coverage Δ
src/napari_time_series_plotter/_dock_widget.py	100.00% <100.00%> (ø)
...ari_time_series_plotter/_tests/test_dock_widget.py	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 21da60d...bde31d0. Read the comment docs.