feat: add more benchmarks and clean up code

[beckermr]

This PR adds more benchmarks and cleans up the benchmark code to remove duplication.

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #102 will create unknown performance changes

_{Comparing more-bench (1684968) with main (b8348bd)}

Summary

🆕 11 new benchmarks ⁉️ 2 (👁 2) dropped benchmarks

Benchmarks breakdown

	Benchmark	main	more-bench	Change
🆕	test_benchmarks_interpolated_image[compile]	N/A	77 ms	N/A
🆕	test_benchmarks_interpolated_image[run]	N/A	77.3 ms	N/A
👁	test_benchmarks_interpolated_image_jit_compile	1.6 s	N/A	N/A
👁	test_benchmarks_interpolated_image_jit_run	77.8 ms	N/A	N/A
🆕	test_benchmarks_lanczos_interp[kval-conserve_dc-compile]	N/A	42.4 ms	N/A
🆕	test_benchmarks_lanczos_interp[kval-conserve_dc-run]	N/A	42.5 ms	N/A
🆕	test_benchmarks_lanczos_interp[kval-no_conserve_dc-compile]	N/A	3.9 ms	N/A
🆕	test_benchmarks_lanczos_interp[kval-no_conserve_dc-run]	N/A	4.2 ms	N/A
🆕	test_benchmarks_lanczos_interp[xval-conserve_dc-compile]	N/A	2.3 ms	N/A
🆕	test_benchmarks_lanczos_interp[xval-conserve_dc-run]	N/A	2.5 ms	N/A
🆕	test_benchmarks_lanczos_interp[xval-no_conserve_dc-compile]	N/A	1.7 ms	N/A
🆕	test_benchmarks_lanczos_interp[xval-no_conserve_dc-run]	N/A	1.7 ms	N/A
🆕	test_benchmarks_metacal[run]	N/A	1.4 s	N/A

[beckermr]

This PR has no functional changes and only adds benchmarks for testing further changes in #101. Thus I am going to merge it. Happy to push changes later.