Swtich from Requires.jl to package extensions

[frankier]

Might it be possible to switch from Requires.jl to package extensions? These should be faster to precompile.

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By the way, I'm actually asking for this because I'm running into a bug. Here it is, however, I'm having trouble making a MWE, and I don't think FilePaths.jl is at fault here.. It may be to do with interactions between Revise and Requires. At any rate, it seems like Requires.jl is heading for deprecation.

ERROR: LoadError: InitError: KeyError: key Base.PkgId(Base.UUID("8fc22ac5-c921-52a6-82fd-178b2807b824"), "FilePaths") not found
Stacktrace:
  [1] getindex
    @ ./dict.jl:477 [inlined]
  [2] macro expansion
    @ ./lock.jl:273 [inlined]
  [3] root_module(key::Base.PkgId)
    @ Base ./loading.jl:2319
  [4] parse_pkg_files(id::Base.PkgId)
    @ Revise ~/.julia/packages/Revise/doDG7/src/loading.jl:49
  [5] watch_package(id::Base.PkgId)
    @ Revise ~/.julia/packages/Revise/doDG7/src/pkgs.jl:349
  [6] add_require(sourcefile::String, modcaller::Module, idmod::String, modname::String, expr::Expr)
    @ Revise ~/.julia/packages/Revise/doDG7/src/pkgs.jl:188
  [7] withnotifications(::Any, ::Vararg{Any})
    @ Requires ~/.julia/packages/Requires/Z8rfN/src/require.jl:70
  [8] (::FilePaths.var"#8#17")()
    @ FilePaths ~/.julia/packages/Requires/Z8rfN/src/require.jl:106
  [9] listenpkg(f::Any, pkg::Base.PkgId)
    @ Requires ~/.julia/packages/Requires/Z8rfN/src/require.jl:20
 [10] macro expansion
    @ ~/.julia/packages/Requires/Z8rfN/src/require.jl:98 [inlined]
 [11] __init__()
    @ FilePaths ~/.julia/packages/FilePaths/ULnpu/src/FilePaths.jl:14
 [12] run_module_init(mod::Module, i::Int64)
    @ Base ./loading.jl:1263
 [13] register_restored_modules(sv::Core.SimpleVector, pkg::Base.PkgId, path::String)
    @ Base ./loading.jl:1251
 [14] _include_from_serialized(pkg::Base.PkgId, path::String, ocachepath::String, depmods::Vector{Any}, ignore_native::Nothing)
    @ Base ./loading.jl:1195
 [15] _include_from_serialized
    @ ./loading.jl:1152 [inlined]
 [16] _require_search_from_serialized(pkg::Base.PkgId, sourcepath::String, build_id::UInt128, stalecheck::Bool; reasons::Dict{String, Int64}, DEPOT_PATH::Vector{String})
    @ Base ./loading.jl:1900
 [17] _require(pkg::Base.PkgId, env::String)
    @ Base ./loading.jl:2378
 [18] __require_prelocked(uuidkey::Base.PkgId, env::String)
    @ Base ./loading.jl:2243
 [19] #invoke_in_world#3
    @ ./essentials.jl:1077 [inlined]
 [20] invoke_in_world
    @ ./essentials.jl:1074 [inlined]
 [21] _require_prelocked(uuidkey::Base.PkgId, env::String)
    @ Base ./loading.jl:2230
 [22] macro expansion
    @ ./loading.jl:2169 [inlined]
 [23] macro expansion
    @ ./lock.jl:273 [inlined]
 [24] __require(into::Module, mod::Symbol)
    @ Base ./loading.jl:2126
 [25] #invoke_in_world#3
    @ ./essentials.jl:1077 [inlined]
 [26] invoke_in_world
    @ ./essentials.jl:1074 [inlined]
 [27] require(into::Module, mod::Symbol)
    @ Base ./loading.jl:2119
during initialization of module FilePaths