feat: CacheFS improvement - Folder support

[john-george]

What did you implement:

Ability to instantiate CacheFS for a specific folder, to allow purging of cached files beyond just deleting individual files by key.

How did you implement it:

For example:

' @import /components/CacheFS.brs from @dazn/kopytko-utils
' @import /components/ternary.brs from @dazn/kopytko-utils
' @import /components/http/cache/CachedHttpResponse.brs
function HttpCache() as Object
  prototype = {}

  prototype._cacheFS = CacheFS("httpCache")

  ...

in https://github.com/getndazn/kopytko-framework/blob/master/src/components/http/cache/HttpCache.brs would allow us to purge all http related cache via a new method like so:

  ' @returns {Boolean} - true if cache in context has been purged
  prototype.clear = sub () as Boolean
    return m._cacheFS.clear()
  end sub

How can we verify it:

Todos:

• Write documentation (if required)
• Write new unit tests
• Fix linting errors
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES
Is it a breaking change?: NO

[pawelhertman]

Great job! Please add "feat:" prefix to the PR's title

[john-george]

@pawelhertman, thanks for the feedback! they have been addressed in ac3c166 (#22)

(did you check if createDirectory can create nested folders?)

checked and confirmed that a directory path notation is supported only if a parent folder exists for each level of nested folder.

[github-actions]

🎉 This PR is included in version 2.4.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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