Implementing usage of forbidden_chars for file/folder uploads

[nc-fkl]

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Feature description

Hi Android Team,

there is a forbidden_characters=[....] feature in the WebUI that disallows the usage for renaming/uploading/moving of files & folders with specific characters that are forbidden.
Could we also implement this in the Android Client so that it is in sync with the frontend?

• fix(files): disallow illegal characters server#40585
• Disallow illegal characters / ? < > \ : * | " and so on in file and folder names server#38614
• [Bug]: 'forbidden_chars' Not Enforced During File Uploads server#43423

Thank you for your effort! :)

[susnux]

For implementation: This PR will add the characters to the capabilities:
nextcloud/server#43775

• Get the capability "forbidden_filename_characters" from the files app.
• This is an array of forbidden characters (could be multibyte characters, so it is an array of strings).
• If any of the strings in the array matches the filename it is considered invalid.