Implement filesystem class with BrowserFS

[ashwinkjoseph]

Task Description
Implement the abstract class for filesystem using BrowserFS

In the context of TPF, a file system should have the following behaviour:

• Should maintain keep track of the files and directories in it. (This is taken care of by browserFS itself)
• Should store references to files which can be used to retrieve and store content in the file (This is taken care of by browserFS itself)
• Should maintain a list of cursors, keeping track of the position of each of the cursor in the filesystem
• Should provide the option to change the working directory of a cursor
• Should provide the option to list the contents of the working directory of the cursor (if given a path it should list the contents in the given path and ignore the working directory of the cursor)
• Should have a method which accepts the content and metadata of a file and saves it to a specified path in the filesystem (expose API from browserFS)
• Should have a method for getting the content of a file given its path (expose API from browserFS)
• Should have a method which adds directories to the working directory of the cursor (if given a path, it should use the path instead of the working directory of the cursor)
• Should have a method which removes directories and files working directory of the cursor (if given a path, it should use the path instead of the working directory of the cursor)

Acceptance criteria for task

• Should call the browserFS install method passing a reference to itself when initializing. for reasoning, read comments here

** Rest is to be discussed on call **

Additional context
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