Fast FlatRule

[adrhill]

In local tests, this was ~1000x faster:

                                                    ID                 time ratio               memory ratio
  –––––––––––––––––––––––––––––––––––––––––––––––––––– –––––––––––––––––––––––––– ––––––––––––––––––––––––––
                        ["Layer", "Dense", "FlatRule"] 0.00 (5%) :whitecheckmark: 0.00 (1%) :whitecheckmark:

going from 46.238 μs

                                                    ID            time    GC time          memory allocations
  –––––––––––––––––––––––––––––––––––––––––––––––––––– ––––––––––––––– –––––––––– ––––––––––––––– –––––––––––

                        ["Layer", "Dense", "FlatRule"]  46.238 μs (5%)            200.02 KiB (1%)          11

to 48.798 ns:

                                                    ID            time    GC time          memory allocations
  –––––––––––––––––––––––––––––––––––––––––––––––––––– ––––––––––––––– –––––––––– ––––––––––––––– –––––––––––

                        ["Layer", "Dense", "FlatRule"]  48.798 ns (5%)                                       

[codecov-commenter]

Codecov Report

Merging #96 (c42dbce) into master (185cd64) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #96      +/-   ##
==========================================
+ Coverage   95.31%   95.36%   +0.04%     
==========================================
  Files          16       16              
  Lines         576      582       +6     
==========================================
+ Hits          549      555       +6     
  Misses         27       27              

Impacted Files	Coverage Δ
src/lrp/rules.jl	97.40% <100.00%> (+0.10%)	⬆️

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