Investigate supporting fee calculations in all Kusama runtimes

[emostov]

Currently we only support Kusama runtime spec versions >= 1062

substrate-api-sidecar/calc/src/calc_fee.rs

Lines 43 to 47 in 081b8b3

	("kusama", 1062) => V0(new_legacy_128(inner)),
	("kusama", v) if 1062 < v && v < 2011 => V1((new_i128(inner), false)),
	("kusama", v) if 2011 <= v => V2(new_u128(inner)),

With recent increase interest in Kusama it is worth seriously exploring how we can indefinitely support fee calculations for older Kusama runtimes.