Enhance DataInspector with dim conversions

[mathieu17g]

Feature description

Convert values shown in DataInspector with corresponding axis dimension conversions

Here is a light mockup of what it could be for DateConversion and for Line and LineSegment plots

Add a value to dimension conversion in dates-integrations.jl

# Conversions to DateTimeConversion.type
function convert_value_dim(conversion::DateTimeConversion, value)
    return number_to_date(conversion.type[], value)
end
convert_value_dim(::Union{Nothing, NoDimConversion}, value) = value

Replace position2string functions in inspector.jl with ones using dimension conversions

value2string(conversion::T, value) where {T<:Union{Nothing,<:AbstractDimConversion}} =
    (converted = convert_value_dim(conversion, value)) isa AbstractFloat ?
        @sprintf("%0.3f", converted) : string(converted)
dimspos2string(conversions, p::StaticVector{2}) = 
    @sprintf("x: %s\ny: %s", 
             (value2string(c, p) for (c, p) in zip(ntuple(i -> conversions[i], 2), p))...)
dimspos2string(conversions, p::StaticVector{3}) = 
    @sprintf("x: %s\ny: %s\nz: %s",
             (value2string(c, p) for (c, p) in zip(ntuple(i -> conversions[i], 3), p))...)

Use them in show_data functions

    if to_value(get(plot, :inspector_label, automatic)) == automatic
<<<     tt.text[] = position2string(eltype(plot[1][])(pos))
>>>     conversions = get_conversions(plot)
>>>     tt.text[] = dimspos2string(conversions, eltype(plot[1][])(pos))
    else
...

Output plot example

Examples code

using GLMakie
using Dates

# Sample data
dates = [Date(2022, 1, 1) + Dates.Day(i) for i = 0:10]
values = [1, 3, 2, 4, 5, 3, 6, 4, 7, 6, 8]

fig = Figure(size=(800, 600))
axis = Axis(fig[1, 1], xlabel = "Date", ylabel = "Value")
lines!(axis, dates, values)
DataInspector(fig)
display(fig)

Before

After