feat: create py.typed to enable better typing support

[my1e5]

This PR adds a py.typed to the tsdownsample directory. This allows type checkers like mypy to support type checking.

Closes #86

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (05334d5) to head (6aeafa6).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #90   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files          4       4           
  Lines        371     371           
=====================================
  Misses       371     371           

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[codspeed-hq]

CodSpeed Performance Report

Merging #90 will degrade performances by 24.95%

_{Comparing my1e5:typing-support (6aeafa6) with main (db142fa)}

Summary

⚡ 8 improvements
❌ 8 regressions
✅ 662 untouched

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	test_m4_no_x[True-float32-100-100,000]	415.6 µs	484 µs	-14.13%
⚡	test_m4_with_x[True-float32-1,000-100,000]	1.8 ms	1.5 ms	+17.68%
⚡	test_minmax_no_x[True-float32-1,000-100,000]	529.1 µs	455.3 µs	+16.2%
⚡	test_minmax_no_x[True-int32-100-100,000]	631 µs	547.2 µs	+15.33%
❌	test_minmax_with_x[True-float64-1,000-100,000]	1.9 ms	2.2 ms	-14.2%
❌	test_minmax_with_x[True-int64-1,000-100,000]	1.9 ms	2.3 ms	-18.39%
❌	test_minmaxlttb_with_x[True-int64-1,000-100,000]	4.4 ms	5.2 ms	-14.58%
⚡	test_nanm4_no_x[True-float32-100-100,000]	434.1 µs	394.6 µs	+10.01%
❌	test_nanm4_with_x[True-float32-1,000-100,000]	1.3 ms	1.5 ms	-10.21%
❌	test_nanm4_with_x[True-int32-1,000-100,000]	1.5 ms	1.9 ms	-20.94%
⚡	test_nanminmax_no_x[True-float32-100-100,000]	472.2 µs	416.8 µs	+13.29%
⚡	test_nanminmax_with_x[True-float32-1,000-1,000,000]	4 ms	3.6 ms	+11.85%
❌	test_nanminmax_with_x[True-float32-1,000-100,000]	1.5 ms	1.9 ms	-24.95%
⚡	test_nanminmax_with_x[True-int32-1,000-1,000,000]	4.6 ms	3.7 ms	+23.98%
⚡	test_nanminmax_with_x[True-int32-1,000-100,000]	2 ms	1.6 ms	+27.87%
❌	test_nanminmaxlttb_no_x[True-float32-1,000-100,000]	784.6 µs	881 µs	-10.95%

[s4m0r4m4]

Thanks!

[s4m0r4m4]

Do we know when a release will be made with this improvement?

[my1e5]

Do we know when a release will be made with this improvement?

• New release 0.1.5 #92