Implement Voikko Spell and Divvun spell Integration

[satti-hari-krishna-reddy]

Description

This pull request introduces the integration of both Voikko and Divvun spell checkers into the Apertium APy. It is designed to handle spell-checking requests using either Voikkospell or Divvunspell based on user preference.

Features

• Automatically searches for installed Voikko modes and uses them for spell checking.
• Splits input text into tokens and checks each token using the selected spell checker.
• Returns known status and suggestions for each token.
• Handles errors when the requested spelling mode is not installed.
• Allows toggling between Voikko and Divvun spell checkers via a query parameter.

Usage

To toggle between Voikko and Divvun spell checkers, use the spellchecker query parameter. The default spell checker is Voikko.

Example Requests

Voikko:

curl 'http://localhost:2737/spellCheck?q=қазақша билмеймін&lang=kaz'

or

curl 'http://localhost:2737/spellCheck?q=қазақша билмеймін&lang=kaz&spellchecker=voikko'

DivunnSpell:

curl 'http://localhost:2737/spellCheck?q=қазақша билмеймін&lang=kaz&spellchecker=divvun'

Expected Output
For the input text "қазақша билмеймін", the output will be:

[
  {"token": "қазақша", "known": true, "sugg": []},
  {"token": "билмеймін", "known": false, "sugg": ["білмеймін", "билеймін", "билемеймін", "бөлмеймін", "білмейміз"]}
]

[satti-hari-krishna-reddy]

@jonorthwash Could you please review the PR.