Only require ArrayInterfaceCore - #204

Before and after:

```julia
julia> @time_imports using RecursiveArrayTools
     10.7 ms    ┌ MacroTools
     19.2 ms  ┌ ZygoteRules
      2.8 ms  ┌ Compat
      1.4 ms  ┌ Requires
    123.4 ms  ┌ FillArrays
    507.7 ms  ┌ StaticArrays
     17.8 ms      ┌ Preferences
     19.6 ms    ┌ JLLWrappers
    184.0 ms  ┌ LLVMExtra_jll
      5.1 ms      ┌ CEnum
    108.6 ms    ┌ LLVM
      1.9 ms    ┌ Adapt
    804.4 ms  ┌ GPUArrays
      5.8 ms  ┌ DocStringExtensions
      1.3 ms  ┌ IfElse
     39.8 ms  ┌ RecipesBase
     40.6 ms    ┌ Static
    504.1 ms  ┌ ArrayInterface
     73.6 ms  ┌ ChainRulesCore
   2332.6 ms  RecursiveArrayTools

julia> @time_imports using RecursiveArrayTools
    10.1 ms    ┌ MacroTools
    18.7 ms  ┌ ZygoteRules
    2.6 ms  ┌ Compat
123.9 ms  ┌ FillArrays
521.7 ms  ┌ StaticArrays
    18.4 ms      ┌ Preferences
    20.2 ms    ┌ JLLWrappers
173.5 ms  ┌ LLVMExtra_jll
    4.8 ms      ┌ CEnum
103.7 ms    ┌ LLVM
    2.0 ms    ┌ Adapt
815.3 ms  ┌ GPUArrays
    5.2 ms  ┌ DocStringExtensions
    40.3 ms  ┌ RecipesBase
    2.6 ms  ┌ ArrayInterfaceCore
    56.6 ms  ┌ ChainRulesCore
1822.5 ms  RecursiveArrayTools
```