feat(android): Add menu to specify long-press delay

[darcywong00]

Addresses the UI portion of #877.

A separate PR will integrate passing the custom long-press duration into KeymanWeb.

The slider in the menu has discrete positions from [0,7] and correspond to long-press durations 0.3s to 1.5s.
Internally, they code keeps track of the current long-press delay as milliseconds, and the default KeymanWeb duration is 500ms.

Screenshots

The menu to adjust the long-press delay is accessed in Keyman Settings

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Position at default 0.5s

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Position at 1.3s

User Testing

Setup - Install the PR build of Keyman for Android

• TEST_MENU - Verifies the value of the longpress delay can be adjusted from 0.3s to 1.5s

1. Launch Keyman and dismiss the "Get Started" menu
2. In Keyman, go to Settings --> Adjust longpress delay
3. In the "Adjust longpress delay" menu, verify the default is 0.5 seconds
4. Click the left arrow (by the slider) until the minimum delay is reached
5. Verify the delay time says 0.3 seconds
6. Click the back arrow and exit back to the Keyman app
7. In Keyman, go to Settings --> Adjust longpress delay
8. Verify the delay time says 0.3 seconds
9. Click the right arrow (by the slider) until the maximum delay is reached
10. Verify the delay time says 1.5 seconds
11. Click the back arrow and exit back to the Keyman app
12. In Keyman, go to Settings --> Adjust longpress delay
13. Verify the delay time says 1.5 seconds

[keymanapp-test-bot]

User Test Results

Test specification and instructions

• ✅ TEST_MENU (PASSED) (notes)

[dinakaranr]

Test Results

I tested this issue with the attached "Keyman 18.0.88-alpha-test-12170" build on the Android 14 physical device and Android 9(emulator) Here is my observation.

• TEST_MENU (Passed):

1. Installed the "Keyman-18.0.88.apk" file and gave all permissions to the application.
2. Checked the "Enable Keyman as system-wide keyboard" and set the keyboard as the default keyboard box on the settings page.
3. Open the Keyman app. Enable the "Predictions" to install the "Dictionary."
4. Added a sentence to the notepad and Chrome (search).
5. "Adjust long-press delay" appears under the settings.

0.5s is the minimum time and 1.5s maximum time. I can alter the timing and make it available when I reopen the app.
I have followed the steps and works as expected. It works great for me. Thank you.

[mcdurdin]

LGTM, nits only

[keyman-server]

Changes in this pull request will be available for download in Keyman version 18.0.93-alpha