New System App Module for easy file systems access

[IceOnly]

Migration of microsoft/ALAppExtensions#23225

Now that we have made several clients Universal code ready.
One of the main problems turned out to be the replacement of the file record and the file object (File.Create, File.Exists).
Some of our customers now use Azure Blob Service from the System app. Others don't have a good internet and now use a local microservice with REST API, others use Azure File Shares.
The problem is that every integration is different. I think many other partners will have the same problem.
To simplify access I have adopted the email module and created new file accounts.
With just one codeunit, a developer can now connect to various file services without having to know how they actually work. The code unit "File System" delviers everything taht is needed.

An additional PR contains three connector apps:
microsoft/ALAppExtensions#23225

This Apps will conenct:

• Azure Blob Storage
• Azure File Share
• SharePoint Online

All three service can be access over one unified interface!

New provider in the future could be:

• a OneDrive Provider
• Third Party file services

An example that shows how simple it is to use the new modules can be found here:
https://github.com/IceOnly/BC_FileSystem_Example

But before I go round the whole thing, I'm interested in whether there is any interest in the module at all.

Here are some Screenshots:

I have decided in favour of some restrictions. Paths must not start with a /. The only supported path separator is /. If services that require a \ are to be connected, this must be translated by the connector app.

These restrictions should ensure that the file service can be exchanged without upgrading data.

[github-actions]

Could not find linked issues in the pull request description. Please make sure the pull request description contains a line that contains 'Fixes #' followed by the issue number being fixed. Use that pattern for every issue you want to link.

[JesperSchulz]

This PR needs some work before the real code review can conducted.

[IceOnly]

@IceOnly Application Areas are missing on multiple places, didn't commented that. Please check all places

I found only one place. Should be correct now on every page.

[JesperSchulz]

Try to enable the codecops. You've got a few issues to address to satisfy the rules.
I'll progress to the functional review now.

[JesperSchulz]

We cannot use Blobs of subtype bitmap anymore. We should use Media instead.

[IceOnly]

Solved.

[JesperSchulz]

Alright, let's run the CI once more and see where we land. Would be real good to get this one processed this week.

[JesperSchulz]

@IceOnly, could you look at the build failures, while I test your feature? Seem to be easy CodeCop issues. We need a successful build, before we can push this forward.
The declared goal is now to release this feature with 25.1 in November. I had targeted 25.0, but had too many PRs to process to include this large one.

[IceOnly]

@JesperSchulz done!

[JesperSchulz]

If we are to accept this module, we want to have some uptake of it in the Base Application. We're currently looking into possible scenarios!

Background: ideally, we no longer want to have modules without any uptake - for 2 reasons:

1. When we don't have uptake, we don't test the features in manual E2E tests, and hence often don't catch bugs
2. Even though considerable work went into developing the module, the standard Business Central customer doesn't get any value out of it, as the capability doesn't surface in a vanilla implementation.

Work is in progress!