- Initial add of country code, no tests
- Add tests for getBillingConfig

fixes flutter/flutter/issues/141627

Hold merging on:

…t(), and addPayment() to pigeon (#5910)

Part 1 of flutter/flutter#117910

This PR converts storefront(), addPayment(), transactions(), and
canMakePayment().


## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] All existing and new tests are passing.

fixes [[`rfw`]  Restore RFW to 100% coverage after ButtonBar update](flutter/flutter#142602)

### Before

![BEFORE](https://github.com/flutter/packages/assets/48603081/b0671646-d74e-4cc8-a421-23b7130788c8)

### After 

![AFTER](https://github.com/flutter/packages/assets/48603081/c55c7974-fc8f-4c0a-a853-9f4fdf622bac)

Fixes flutter/flutter#131224
 
��  [Design Doc](https://docs.google.com/document/d/1UekXjG_VKmWYbsxDEzMqTb7F-6oUr05v998n5IqtVWs/edit?usp=sharing) �� 

This adds support for merged cells in TableView.
This contains a breaking change that will require all children of the TableView to be a TableViewCell.

![Screenshot 2024-01-25 at 4 38 49�PM](https://github.com/flutter/packages/assets/16964204/02f4c158-23e9-401e-ac84-b6303d999095)

Expand the multiple-test-files workaround in `drive-examples` from macOS to all of the desktop platforms, now that we know it's not macOS-specific.

See flutter/flutter#135673

…5727)

## Description
This pull request exposes the Android and iOS HTTP Basic Authentication feature to users of the `webview_flutter` plugin. It is the final PR in a sequence of PRs. Previous PRs are #5362, #5454 and #5455.

Issues fixed by PR:
Closes flutter/flutter#83556

flutter/flutter@ace9181...75a2e5b

2024-01-30 [email protected] Reset
framesEnabled to default value at the end of each test
(flutter/flutter#141844)
2024-01-30 [email protected] Fix SliverMainAxisGroup geometry
cacheExtent (flutter/flutter#142482)
2024-01-30 [email protected] Roll Flutter Engine from
0e586d1c28c8 to f02a4a80a77e (3 revisions) (flutter/flutter#142528)
2024-01-30 [email protected] Roll Packages from
516648a to 25abb5d (6 revisions) (flutter/flutter#142527)
2024-01-30 [email protected] Roll Flutter Engine from
438e9b4d7d4e to 0e586d1c28c8 (4 revisions) (flutter/flutter#142515)
2024-01-30 [email protected] Using
`initExpensiveAndroidView` for Android Hybrid Composition Mode
(flutter/flutter#142399)
2024-01-30 [email protected] Roll Flutter Engine from
ed73d40a8c93 to 438e9b4d7d4e (1 revision) (flutter/flutter#142508)
2024-01-30 [email protected] Organize leak tracking TODOs.
(flutter/flutter#142460)
2024-01-30 [email protected] Roll Flutter Engine from
5584a78a439b to ed73d40a8c93 (1 revision) (flutter/flutter#142504)
2024-01-30 [email protected] Roll Flutter Engine from
df5f1afd4991 to 5584a78a439b (2 revisions) (flutter/flutter#142503)
2024-01-30 [email protected] Roll Flutter Engine from
65bf8b1db4d1 to df5f1afd4991 (1 revision) (flutter/flutter#142501)
2024-01-30 [email protected] Roll Flutter Engine from
c9268c7db03c to 65bf8b1db4d1 (1 revision) (flutter/flutter#142496)
2024-01-30 [email protected] Roll Flutter Engine from
e21208583956 to c9268c7db03c (1 revision) (flutter/flutter#142492)
2024-01-29 [email protected] Roll Flutter Engine from
bedafa8794b6 to e21208583956 (1 revision) (flutter/flutter#142483)
2024-01-29 [email protected] Revert "Reland:
"Fix how Gradle resolves Android plugin" (#137115)"
(flutter/flutter#142464)
2024-01-29 [email protected] Marks Mac_pixel_7pro
native_assets_android to be unflaky (flutter/flutter#141675)

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