This package should look like Unitful.jl but behave like DynamicQuantities.jl under the hood

Tasks:
1.  Build out documentation and a docs badge
    -   Include all-stops-out tutorial on defining a new dimension "RadDims"
    -   Add angle to the dimension list
    -   Create a new unit registry with that dimension 
    -   Re-tool sin, cos, tan rules on this particular dimension
2.  Add "unit_info(u::Union{Dimension, AbstractUnit{Dimension}})" 
    -   Maps dimensions to a meaning (like Force or Inductance) and lists other units of that dimension
    -   This can be done without documentation 
        -   Use Dict{Dimension,String} to find dimension "meaning" (determine this by unique dimensions)
        -   Iterate over registry and list other units that match the query dimension
3. Announce the package


import DynamicQuantities
import Unitful
using BenchmarkTools

v1flex = ubase.([1u"m/s", 1u"J/kg", 1u"A/V"])
v1uni  = [1*Unitful.u"m/s", 1*Unitful.u"J/kg", 1*Unitful.u"A/V"]
v1dyn  = [1*DynamicQuantities.u"m/s", 1*DynamicQuantities.u"J/kg", 1*DynamicQuantities.u"A/V"]

@btime sum(x->x^0.0, v1uni)
@btime sum(x->x^0.0, v1flex)
@btime sum(x->x^0.0, v1dyn)

t1flex = ubase.((1u"m/s", 1u"J/kg", 1u"A/V"))
t1uni  = (1*Unitful.u"m/s", 1*Unitful.u"J/kg", 1*Unitful.u"A/V")
t1dyn  = (1*DynamicQuantities.u"m/s", 1*DynamicQuantities.u"J/kg", 1*DynamicQuantities.u"A/V")

@btime sum(x->x^0, t1uni)
@btime sum(x->x^0, t1flex)
@btime sum(x->x^0, t1dyn)

Considerations:
N.  Consider commutative macro for promote_rule to prevent repetition
        https://discourse.julialang.org/t/techniques-for-defining-commutative-functions/113406/5
