Remove Requires.jl usage through subpackaging

[ChrisRackauckas]

DiffEqBayes.jl/src/DiffEqBayes.jl

Lines 21 to 25 in ea7fa7c

	@require DynamicHMC="bbc10e6e-7c05-544b-b16e-64fede858acb" begin
	using .DynamicHMC, TransformVariables, LogDensityProblems
	include("dynamichmc_inference.jl")
	export dynamichmc_inference
	end

Similar to the LinearSolve.jl formulation.