add rust crate spatialtime

[ringsaturn]

https://github.com/moranbw/spatialtime

running 8 tests
test benches_tz_crates::bench_rtz_get_timezone_ned_random_city ... bench:         700.23 ns/iter (+/- 77.20)
test benches_tz_crates::bench_rtz_get_timezone_osm_random_city ... bench:       2,726.19 ns/iter (+/- 190.78)
test benches_tz_crates::bench_spatialtime_ned                  ... bench:   4,594,597.05 ns/iter (+/- 116,025.15)
test benches_tz_crates::bench_spatialtime_osm                  ... bench: 127,112,385.60 ns/iter (+/- 5,923,008.03)
test benches_tz_crates::bench_tz_search_lookup_random_city     ... bench:         140.25 ns/iter (+/- 39.40)
test benches_tz_crates::bench_tzf_default_finder_random_city   ... bench:       1,959.88 ns/iter (+/- 117.59)
test benches_tz_crates::bench_tzf_finder_random_city           ... bench:       7,249.29 ns/iter (+/- 317.04)
test benches_tz_crates::bench_tzf_fuzzy_finder_random_city     ... bench:         766.83 ns/iter (+/- 28.58)

test result: ok. 0 passed; 0 failed; 0 ignored; 8 measured; 0 filtered out; finished in 58.85s