incorrect norms for vectors with typemin(Int)

[stevengj]

Our L1 and Linf norms give a negative result for typemin(Int) (since the abs function wraps around), even though they return a floating-point result (see #29685) that could represent the correct answer.

julia> norm([typemin(Int), typemin(Int)], Inf) # wrong
-9.223372036854776e18

julia> norm([typemin(Int), typemin(Int)], 1) # wrong
-1.8446744073709552e19

julia> norm([typemin(Int), typemin(Int)], 2) # correct
1.3043817825332783e19

Suggested solution: convert to float before computing abs in these functions.

The hypot function has a similar problem.

cc @andreasnoack