feat(ui): add input event to QInput

[NitroRCr]

What kind of change does this PR introduce?

• [x] Bugfix
• [x] Feature
• [ ] Documentation
• [ ] Code style update
• [ ] Refactor
• [ ] Build-related changes
• [ ] Other, please describe:

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

The PR fulfills these requirements:

• [x] It's submitted to the dev branch (or v[X] branch)
• [ ] When resolving a specific issue, it's referenced in the PR's title (e.g. fix: #xxx[,#xxx], where "xxx" is the issue number)
• [ ] It's been tested on a Cordova (iOS, Android) app
• [ ] It's been tested on an Electron app
• [ ] Any necessary documentation has been added or updated in the docs or explained in the PR's description.

If adding a new feature, the PR's description includes:

• [x] A convincing reason for adding this feature (to avoid wasting your time, it's best to start a new feature discussion first and wait for approval before working on it)

Other information:

Due to IME composition detection, model-value of QInput does not update during the IME composition process. However, there are times when we want to handle input during the IME composition process. (referring PR #17476 ) Therefore, input event has been added:

• Emitted during input, even during IME composition.
• No debounce.

The corresponding event was not added on QSelect because the native input event can be directly listened to on QSelect.

Additionally, a bug in select-part-7-text.vue in the playground has been fixed.