[Code Parser]: Ability to figure out object dependencies based on a static code

[m7pr]

Feature description

The feature will provide a code parser that as an input will get the code as text and will parse it the way that it is able to return all needed code the recreate any object from the original input code. If there are any side effects in the code, that do not precisely specify which object(s) they influence, a user is able to add a comment with a tag # @effect object_name1 object_name2 to specify the objects influenced by this side effect, so that the side effect is also returned with the code needed to create objects.

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[m7pr]

We had a long and fruitful discussion today with @gogonzo and agreed that we do the following:

• remove keep.source = FALSE from parse for character metods in new_qenv and eval_code
• extend new_qenv and eval_code with code_info field that would contain information from get_children and it's derivatives - this should be as minimal information as possible needed to extract the code later
• code will be analyzed and extracted on get_code() calls
• object$code_info needs to be combined before object$code is combined as object$code looses srcref attribute on combining
• divide the current code example in dev/code-parser.R into multiple codes and try it in multiple eval_codes chain