cli: Add support for intrsopection AST of files

alib2cli/src/ast/command/AstIntrospectionCommand.h

alib2cli/src/ast/statements/ImmediateStatement.h

alib2cli/src/environment/Environment.cpp

alib2cli/src/grammar/AltCliParser.g4

alib2cli/src/parser/AltVisitor.Command.cpp

alib2cli/src/parser/AltVisitor.h

alib2cli/test-src/aql/basic/ast/introspect.aql.ast

alib2cli/test-src/aql/basic/introspect.aql