[NM-1085] Set status as in progress when wechat is launched

[aw-hector]

This PR fixes the unstoppable loading when user comes back from Wechat during the payment by:

• Setting payment status as In Progress and notifying the merchant/sample app when Wechat is launched
• Sample/merchant app can have custom handler of dismissing the spinner or showing a confirm dialog to ask user if he finishes the payment

[github-actions[bot]]

Unit Test Results

228 tests  +3   228 :heavy_check_mark: +3   1m 55s :stopwatch: +16s   95 suites ±0       0 :zzz: ±0    95 files   ±0       0 :x: ±0 

Results for commit 318aba6e. ± Comparison against base commit 34083544.

This pull request removes 1 and adds 4 tests. Note that renamed tests count towards both.

``` com.airwallex.wechat.WeChatComponentTest ‑ test ``` ``` com.airwallex.wechat.WeChatComponentTest ‑ test handlePaymentIntentResponse when WeChat Pay is successfully initiated com.airwallex.wechat.WeChatComponentTest ‑ test handlePaymentIntentResponse when next action data is empty com.airwallex.wechat.WeChatComponentTest ‑ test handlePaymentIntentResponse when next action data is null com.airwallex.wechat.WeChatComponentTest ‑ test provider ```

:recycle: This comment has been updated with latest results.