Set different `verbose` values for `PMD.Parser`

Currently, the verbose option for the PMD.Parser is a Bool. Should we change it for an Int or Enum, so the user can select how much detail they want from the parser´s log?

PSRClassesInterface.jl/src/PMD/parser/parser.jl

Lines 3 to 25 in 48a9bae

    
           mutable struct Parser 
        
               # io pointer to read from 
        
               io::IO 
        
               # original pmd path and current line number, used to 
        
               # compose better error/warning messages 
        
               path::String 
        
               lineno::Int 
        
               # current parser state 
        
               state::Vector{Any} 
        
               # items to be merged 
        
               merge::Dict{String, Vector{Any}} 
        
               # whether to display warnings 
        
               verbose::Bool 
        
               # Study info 
        
               data_struct::DataStruct 
        
               relation_mapper::RelationMapper 
        
               model_template::ModelTemplate

	mutable struct Parser
	# io pointer to read from
	io::IO

	# original pmd path and current line number, used to
	# compose better error/warning messages
	path::String
	lineno::Int

	# current parser state
	state::Vector{Any}

	# items to be merged
	merge::Dict{String, Vector{Any}}

	# whether to display warnings
	verbose::Bool

	# Study info
	data_struct::DataStruct
	relation_mapper::RelationMapper
	model_template::ModelTemplate