EB initialization with Parser (#1980)

If `warpx.eb_implicit_function = ...` is present in input parameters, Parser
will be used to initialize EB.  For example,
```
warpx.eb_implicit_function = "max(max(max(x-0.5,-0.5-x), max(y-0.5,-0.5-y)), max(z-0.5,-0.5-z))"
```
specifies a box with boundaries at x=+-0.5, y=+-0.5 and z=+-0.5 and regular
domain inside the box.
```
warpx.eb_implicit_function = "-(x**2+y**2+z**2-0.2**2)"
```
specifies a solid sphere at (0,0,0) with a radius of 0.2.

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