Feature: Use better approximation for `power`

[ZCG-coder]

Is your feature request related to a problem? Please describe.
When $b$ is not an integer, $a^b$ can be computed as $e^{b \ln(a)}$. This approach is much faster than calling root.

Describe the solution you'd like
Switch the approximation method for power.

Describe alternatives you've considered
None yet

Additional context
Proof of the method

$$ \begin{align} a ^ { b } &= e ^ { b \ln ( a ) } \\ &= e ^ {{ b } ^ { \ln(a) }} \\ &= e ^ { \ln ( a ) ^ { b } } \\ &= a ^ { b } \end{align} $$