uber / h3-go / 23508937904

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feat: optimize int pow for NumCells (#107)

We can use a lookup table here since we're only checking powers of 7 for MaxResolution.

```
goos: darwin
goarch: arm64
pkg: github.com/uber/h3-go/v4
cpu: Apple M3 Max
               │ /tmp/before.txt │           /tmp/after.txt           │
               │     sec/op      │   sec/op     vs base               │
NumCells/0-16        1.980n ± 1%   1.925n ± 3%   -2.73% (p=0.017 n=6)
NumCells/1-16        1.964n ± 1%   1.910n ± 0%   -2.70% (p=0.002 n=6)
NumCells/2-16        1.978n ± 1%   1.911n ± 4%   -3.41% (p=0.026 n=6)
NumCells/3-16        2.552n ± 2%   1.911n ± 2%  -25.12% (p=0.002 n=6)
NumCells/4-16        2.827n ± 2%   1.936n ± 2%  -31.52% (p=0.002 n=6)
NumCells/5-16        3.035n ± 0%   1.917n ± 2%  -36.85% (p=0.002 n=6)
NumCells/6-16        3.307n ± 1%   1.920n ± 1%  -41.95% (p=0.002 n=6)
NumCells/7-16        3.629n ± 1%   1.964n ± 3%  -45.89% (p=0.002 n=6)
NumCells/8-16        4.016n ± 2%   1.996n ± 1%  -50.29% (p=0.002 n=6)
NumCells/9-16        4.320n ± 2%   2.011n ± 2%  -53.45% (p=0.002 n=6)
NumCells/10-16       4.498n ± 5%   1.985n ± 2%  -55.88% (p=0.002 n=6)
NumCells/11-16       4.763n ± 1%   1.979n ± 2%  -58.44% (p=0.002 n=6)
NumCells/12-16       5.052n ± 1%   1.976n ± 1%  -60.89% (p=0.002 n=6)
NumCells/13-16       5.397n ± 1%   1.907n ± 1%  -64.67% (p=0.002 n=6)
NumCells/14-16       5.754n ± 1%   1.913n ± 0%  -66.75% (p=0.002 n=6)
NumCells/15-16       5.978n ± 2%   1.928n ± 1%  -67.75% (p=0.002 n=6)
geomean              3.573n        1.943n       -45.62%
```

1 of 1 new or added line in 1 file covered. (100.0%)

776 of 776 relevant lines covered (100.0%)

300.22 hits per line