Add emoji autocompletions

[Linfye]

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• This pull request is on a separate branch and not the main branch
• I have tested my code with the ./gradlew lintKotlin detekt test command as directed in the testing section of the contributing guide

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Description

This is a draft PR, and the functionality is not yet complete. I will improve it following the steps below.

1. Load the external English language database into a hash table for easy querying.
2. Obtain the words the user is typing.
3. Retrieve the corresponding emoji from the hash table.
4. Display the emoji on the button.
5. Output the emoji when the button is clicked.
6. Implement these functionalities in SimpleKeyboard to extend support for other languages.

Related issue

• Add emoji autocompletions #66

[github-actions]

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[Linfye]

@andrewtavis I have completed this work, could you review the code? Thanks. 😊

There is still an small problem. After outputting an emoji using this feature, you need to press the backspace twice to delete the outputted emoji.

This seems to be related to the encoding method of the emoji, and it should be possible to resolve this issue by modifying the MyKeyboard.KEYCODE_DELETE part in the onKey function. Or do you have any other suggestions? I can open an issue for this problem after this PR is completed.

[angrezichatterbox]

Thanks, @Linfye for this. Everything looks and functions great.

And yes, I do think modifying the delete key function would be the right choice. We could add a condition where if the previous character is an emoji, it would delete the surrounding twice and the other cases as usual.