impliment iroot and friends for native julia. Much faster for native types

[oscardssmith]

Function	Type	Before (ns)	After (ns)	Speedup
iroot(x, 3)	Int32	127.1	13.9	9.2×
iroot(x, 7)	Int32	97.8	14.7	6.6×
rootrem(x, 3)	Int32	91.7	15.5	5.9×
ispower (non-power)	Int32	98.3	51.8	1.9×
ispower (perfect power)	Int32	137.6	50.7	2.7×
find_exponent (non-power)	Int32	2186.4	112.6	19.4×
find_exponent (perfect power)	Int32	898.8	64.6	13.9×
iroot(x, 3)	Int64	163.7	13.8	11.9×
iroot(x, 7)	Int64	111.6	14.7	7.6×
rootrem(x, 3)	Int64	124.7	15.9	7.9×
ispower (non-power)	Int64	102.4	96.1	1.1×
ispower (perfect power)	Int64	165.3	24.0	6.9×
find_exponent (non-power)	Int64	5859.7	219.0	26.8×
find_exponent (perfect power)	Int64	2639.6	113.7	23.2×
iroot(x, 3)	Int128	210.4	37.8	5.6×
iroot(x, 7)	Int128	186.0	38.2	4.9×
rootrem(x, 3)	Int128	178.5	40.4	4.4×
ispower (non-power)	Int128	116.3	151.6	0.8×
ispower (perfect power)	Int128	212.4	9.4	22.6×
find_exponent (non-power)	Int128	15540.0	432.0	36.0×
find_exponent (perfect power)	Int128	6262.0	174.8	35.8×

[codecov]

Codecov Report

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  Coverage        ?   95.36%           
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  Files           ?        1           
  Lines           ?      151           
  Branches        ?        0           
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  Hits            ?      144           
  Misses          ?        7           
  Partials        ?        0           

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