Bot API 8.0 support

[OlegNovosad]

Telegram just release API 8.0 with more improvements to the mini apps.

I am working on it 🫡🇺🇦

Things to deliver: (will be updated based on merges)

• [x] isActive
• [x] requestFullscreen()
• [x] exitFullscreen()
• [x] lockOrientation()
• [x] unlockOrientation()
• [x] addToHomeScreen()
• [x] checkHomeScreenStatus([callback])
• [x] isFullscreen
• [x] isOrientationLocked
• [x] safeAreaInset
• [x] contentSafeAreaInset
• [x] shareMessage(msg_id[, callback])
• [ ] setEmojiStatus(custom_emoji_id[, params, callback])
• [ ] requestEmojiStatusAccess([callback])
• [x] downloadFile(params[, callback])

New classes:

• [ ] Accelerometer
• [x] DeviceOrientation
• [ ] Gyroscope
• [x] LocationManager

Events:

• [x] activated event
• [x] deactivated event
• [x] safeAreaChanged event
• [x] contentSafeAreaChanged event
• [x] fullscreenChanged event
• [x] fullscreenFailed event
• [x] homeScreenAdded event
• [x] homeScreenChecked event
• [ ] accelerometerStarted event
• [ ] accelerometerStopped event
• [ ] accelerometerChanged event
• [ ] accelerometerFailed event
• [x] deviceOrientationStarted event
• [x] deviceOrientationStopped event
• [x] deviceOrientationChanged event
• [x] deviceOrientationFailed event
• [ ] gyroscopeStarted event
• [ ] gyroscopeStopped event
• [ ] gyroscopeChanged event
• [ ] gyroscopeFailed event
• [x] locationManagerUpdated event
• [x] locationRequested event
• [x] shareMessageSent event
• [x] shareMessageFailed event
• [ ] emojiStatusSet event
• [ ] emojiStatusFailed event
• [ ] emojiStatusAccessRequested event
• [x] fileDownloadRequested event

[khamidjon-khamidov]

@OlegNovosad there have been many changes with the new API. Thanks for the contribution)

[otopba]

@OlegNovosad It will be super nice!

[OlegNovosad]

@khamidjon-khamidov just a follow-up after latest PR:

I plan to work on all full screen and location manager in recent PR. I will also add corresponding events (as well as those I've missed in MR)

[khamidjon-khamidov]

added orientation support https://github.com/khamidjon-khamidov/flutter_telegram_web_app/pull/46

[khamidjon-khamidov]

@OlegNovosad I will work on all home screen features soon

[OlegNovosad]

@khamidjon-khamidov PR #47 for location management and full screen has been opened

[khamidjon-khamidov]

Released v0.2.1 with currently implemented apis by far

[OlegNovosad]

I plan to add accelerometer & gyroscope over the weekend unless you do :) after that with all bot 8.0 I believe it should become 0.3.0 at least

[khamidjon-khamidov]

@OlegNovosad please consider this bugfix. I found out some events are wrapped around JS object even if there is a single field https://github.com/khamidjon-khamidov/flutter_telegram_web_app/pull/49/files