feat: add view bulk imports page

[karantakalkar]

Description

Added view bulk-import page for each bulk import in a single re-usable component configured download/upload template functionality and connected it to the API.

Notes:

• This PR builds upon feat: add bulk import component #564, I propose to have bulk-imports as a component instead of a module.
• Community App implementation involves 18 different controllers for each of the bulk imports, that was most likely the rationale of feat: add bulk import component #564 having bulk imports as module.
• In this PR I have implemented bulk Imports component with a reusable view bulk imports sub-component reason being each of 18 controllers differ only in terms of categorical data which is:
  Name, Entity Type, URL Suffix, Number of Form Fields (Offices,Staff, Legal Form, None).
• On the surface, the controllers seem to have different API requests, but they all are fetching same data (offices, staff) from different endpoints (clients template, centers template, offices).
• I have defined a bulk-imports.ts file which contains categorical data for each of bulk imports.
  route parameter 'name' is used to fetch import specific data upon navigating to a particular import.
• Client is the only import for which significant deviation was needed, because of 'Legal Form' Form Field.
• Comparison b/w bulk-imports
  
• Rest of functionality is same across all bulk-imports.

Related issues and discussion

#633

Screenshots, if any

Checklist

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[muskankhedia]

LGTM!
There is no component for input field of type file and so html5 component has been used. If any other modules could be suggested that will be very helpful.

@abhaychawla Can you please have a review, @karantakalkar have followed a good approach to implement all the functionalities and reduce the modules at the same time.

[muskankhedia]

@karantakalkar Can you make a gif/video displaying the download and upload of files in this section as I am continuously facing errors. And also file download, an encoded form is downloaded whereas in case of community app .xls file is downloaded. Is it the requirement as per now?

[karantakalkar]

The encoded file opens up to be xls only, in community pp implementation is very different, they open up a URL, whereas I am straightaway fetching from API.
Download API request work only for table downloads, I guess the scenario is same in commy app as well, check if there is any difference in API requests that this component makes and the one commy app page makes, as far as I know there wasn't.