Feature request: symbolic_solve with absolute values

[1-Bart-1]

Absolute values are very common in symbolic equations. I would like to be able to solve equations containing absolutes using symbolics.
For example:

julia> @variables x y
2-element Vector{Num}:
 x
 y

julia> lhs = norm([x, y])
sqrt(abs2(y) + abs2(x))

julia> symbolic_solve(lhs, x)
┌ Warning: Var not present in given expression
└ @ Symbolics ~/.julia/packages/Symbolics/YbNrd/src/solver/ia_main.jl:283

Right now this causes a warning related to issue #1377.

Running with lhs = abs(x) gives a different warning:

julia> @variables x y
2-element Vector{Num}:
 x
 y

julia> lhs = abs(x)
abs(x)

julia> symbolic_solve(lhs, x)
┌ Warning: This expression cannot be solved with the methods available to ia_solve. Try a numerical method instead.
└ @ Symbolics ~/.julia/packages/Symbolics/YbNrd/src/solver/ia_main.jl:47