Add 'inline' to get_seed_from_r()

[github-actions[bot]]

This is how benchmark results would change (along with a 95% confidence interval in relative change) if 128a3cddfb61908631968567f75acdba6525e3c1 is merged into main:

• :heavy_check_mark:rexp_test: 84.7ms -> 82.9ms [-5.24%, +1.19%]
• :heavy_check_mark:rnorm_test: 114ms -> 114ms [-2.82%, +3.34%]
• :heavy_check_mark:runif_test: 67.5ms -> 70.2ms [-1.72%, +9.58%] Further explanation regarding interpretation and methodology can be found in the documentation.