Documentation: Add edge size for each cell resolution

[40%]

I have seen the documentation about the resolution (https://h3geo.org/docs/core-library/restable).
There have cell stats about counts, and areas.
I would like to add edge size information for resolution.

An example for the Average area in km2 section.

Res	Average Hexagon Area (km2)	Average Hexagon Edge Size (km)	Pentagon Area (km2)	Average Pentagon Edge Size (km)	Ratio (P/H)
0	4,357,449.416078380	1,295.061026452	2,562,182.162955490	1,220.339069565	0.588
1	609,788.441794133	484.466387564	328,434.586246469	436.918019382	0.539
2	86,801.780398997	182.784082603	44,930.898497879	161.602496466	0.518
3	12,393.434655088	69.066889483	6,315.472267516	60.586857894	0.510
4	1,770.347654491	26.103776162	896.582383141	22.828144580	0.506
5	252.903858182	9.866242466	127.785583023	8.618197516	0.505
6	36.129062164	3.729086015	18.238749548	3.255914889	0.505
7	5.161293360	1.409461862	2.604669397	1.230415568	0.505
8	0.737327598	0.532726501	0.372048038	0.465023631	0.505
9	0.105332513	0.201351690	0.053147195	0.175758237	0.505
10	0.015047502	0.076103786	0.007592318	0.066429764	0.505
11	0.002149643	0.028764526	0.001084609	0.025108000	0.505
12	0.000307092	0.010871972	0.000154944	0.009489928	0.505
13	0.000043870	0.004109206	0.000022135	0.003586867	0.505
14	0.000006267	0.001553116	0.000003162	0.001355678	0.505
15	0.000000895	0.000586929	0.000000452	0.000512560	0.505

via formula

• hexagon: $area = 1.5 * \sqrt{3} * edge^2$
• pentagon: $area = 5 * edge^2 / (4 * \sqrt{5 - 2 * \sqrt{5}})$

Also related to #240

[40%]

This is done in #712