add ranked suggestions to add error

[IanButterworth]

When a package isn't found by name this adds a number of ranked matches (depending on the result scores and terminal width), via the same fuzzyscore search that REPL does for help mode.

If there are no match scores above zero, no suggestions are shown.
It seems like the search could be improved in REPL because it's unfortunate that the diffeq spelling mistake isn't found.
Also the fuzzysort method tweak could be upstreamed.

It adds a bit of slowness, but I think that's ok for this kind of user feedback (this is with 3 registries including General)

master

julia> @time try Pkg.add("Image"); catch  end
  0.009007 seconds (23.61 k allocations: 2.039 MiB)

julia> @time try Pkg.add("Image"); catch  end
  0.008462 seconds (23.62 k allocations: 2.040 MiB)

this PR

julia> @time try Pkg.add("Image"); catch end
  0.027184 seconds (101.59 k allocations: 13.357 MiB)

julia> @time try Pkg.add("Image"); catch end
  0.044085 seconds (101.59 k allocations: 13.357 MiB, 22.40% gc time)

julia> @time try Pkg.add("Image"); catch end
  0.026322 seconds (101.59 k allocations: 13.356 MiB)

Closes #2911

[IanButterworth]

Let's merge to get people trying this out in the first 1.8 cut

[ericphanson]

from Slack- it would be better to use REPL's levsort instead (https://github.com/JuliaLang/julia/blob/f3e3554910a79fa38d5662d14abe04e137075e18/stdlib/REPL/src/docview.jl#L652-L660), which is what the REPL uses for corrections: https://github.com/JuliaLang/julia/blob/f3e3554910a79fa38d5662d14abe04e137075e18/stdlib/REPL/src/docview.jl#L700-L707.

This does a lot better on DifferentielEquations:

julia> levsort("DifferentielEquations", all)
3-element Vector{String}:
 "DifferentialEquations"
 "DifferenceEquations"
 "DifferentialEvolutionMCMC"

vs

julia> fuzzysort("DifferentielEquations", all)
(["DifferentialEvolutionMCMC", "DifferentialDynamicsModels", "DifferentiableStateSpaceModels", "DifferentialEquations", "SimpleDifferentialOperators", "DiscreteDifferentialGeometry", "DifferentialForms", "DifferentialDynamicProgramming", "DifferenceEquations", "AbstractDifferentiation"  …  "BenchmarkingEconomicEfficiency", "BayesianNonparametricStatistics", "ApproxFunOrthogonalPolynomials", "GAP_pkg_normalizinterface_jll", "ReinforcementLearningEnvironmentAtari", "MultivariateOrthogonalPolynomials", "BlackBoxOptimizationBenchmarking", "SemiclassicalOrthogonalPolynomials", "OpenTelemetryExporterOtlpProtoGrpc", "ReinforcementLearningEnvironmentClassicControl"], false)