Move Statistics to an extension

[codecov[bot]]

Codecov Report

Patch coverage: 28.57% and project coverage change: -0.04% :warning:

Comparison is base (c31337a) 27.53% compared to head (16fe224) 27.49%. Report is 5 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #566 +/- ## ========================================== - Coverage 27.53% 27.49% -0.04% ========================================== Files 80 83 +3 Lines 8379 8404 +25 ========================================== + Hits 2307 2311 +4 - Misses 6072 6093 +21 ``` | [Files Changed](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/566?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation) | Coverage Δ | | |---|---|---| | [src/ApproxFunBase.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/566?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL0FwcHJveEZ1bkJhc2Uuamw=) | `48.00% <ø> (+4.00%)` | :arrow_up: | | [src/LinearAlgebra/helper.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/566?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL0xpbmVhckFsZ2VicmEvaGVscGVyLmps) | `56.27% <ø> (+0.69%)` | :arrow_up: | | [src/Operators/Operator.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/566?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL09wZXJhdG9ycy9PcGVyYXRvci5qbA==) | `51.98% <0.00%> (ø)` | | | [src/Operators/banded/CalculusOperator.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/566?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL09wZXJhdG9ycy9iYW5kZWQvQ2FsY3VsdXNPcGVyYXRvci5qbA==) | `17.21% <0.00%> (ø)` | | | [src/Spaces/SumSpace.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/566?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL1NwYWNlcy9TdW1TcGFjZS5qbA==) | `31.98% <0.00%> (ø)` | | | [src/specialfunctions.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/566?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL3NwZWNpYWxmdW5jdGlvbnMuamw=) | `13.87% <0.00%> (-2.90%)` | :arrow_down: | | [ext/ApproxFunBaseSpecialFunctionsExt.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/566?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-ZXh0L0FwcHJveEZ1bkJhc2VTcGVjaWFsRnVuY3Rpb25zRXh0Lmps) | `27.27% <27.27%> (ø)` | | | [src/Operators/general/InterlaceOperator.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/566?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-c3JjL09wZXJhdG9ycy9nZW5lcmFsL0ludGVybGFjZU9wZXJhdG9yLmps) | `23.56% <50.00%> (+0.09%)` | :arrow_up: | | [ext/ApproxFunBaseDualNumbersExt.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/566?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-ZXh0L0FwcHJveEZ1bkJhc2VEdWFsTnVtYmVyc0V4dC5qbA==) | `100.00% <100.00%> (ø)` | | | [ext/ApproxFunBaseStatisticsExt.jl](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/566?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation#diff-ZXh0L0FwcHJveEZ1bkJhc2VTdGF0aXN0aWNzRXh0Lmps) | `100.00% <100.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/JuliaApproximation/ApproxFunBase.jl/pull/566/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaApproximation)

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