added scrape-meta for fullerton_pd

[naumansharifwork]

Added Scrape meta for fullerton pd

• closes clean.platforms.laserfich.fetch_laserfiche #123

This is a laserfiche site, so basically it uses Post requests to get the response in Json format.

The code first downloads the Index Page by using folder Post Requests it gives the insights of the page and provide the ids of the other folders present within the page.
We iterate the folders one by one and if there are files we save them as assets in meta-file and if there is another folder we repeat the step recursively until a folder has only the files not the next folder.

[newsroomdev]

@naumansharifwork could you update the pull request description and explain how this code handling laserfiche files? i am reading the code, but it would be good to make sure laserfiche is getting documented due to its complexity. adding inline comments are helpful, too.