[RNMobile] Fetch VideoPress token

[fluiddot]

⚠️ This PR depends on WordPress/gutenberg#49371 and wordpress-mobile/gutenberg-mobile#5632, so we should hold the merge until that one is merged.

Closes wordpress-mobile/gutenberg-mobile#5512 and closes wordpress-mobile/gutenberg-mobile#5528.

Proposed changes:

• d4fc8fb: Add getMediaToken. Part of the functionality of the web version is not implemented, specifically the fetch of the upload token and the persistence of the token.
• dd070b1: Fetch the token in the block when getting the VideoPress GUID. The token is not used yet but I incorporated this change to have it as an example.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

N/A

Does this pull request change what data or activity we track or use?

N/A

Testing instructions:

Preparation:
Since the token is fetched via a POST request, we need to use changes from wordpress-mobile/gutenberg-mobile#5596.

1. Apply the following patch:

diff --git forkSrcPrefix/projects/packages/videopress/src/client/block-editor/blocks/video/edit.native.tsx forkDstPrefix/projects/packages/videopress/src/client/block-editor/blocks/video/edit.native.tsx
index c3643e2c30a8b9d7ba081b50729af1e08cb3ec5c..8fc6df43a5be2613b4e2f7f9be5c138571f07f1f 100644
--- forkSrcPrefix/projects/packages/videopress/src/client/block-editor/blocks/video/edit.native.tsx
+++ forkDstPrefix/projects/packages/videopress/src/client/block-editor/blocks/video/edit.native.tsx
@@ -82,6 +82,7 @@ export default function VideoPressEdit( {
 			getMediaToken( 'upload', { guid, flushToken: true } )
 				.then( tokenData => {
 					setToken( tokenData.token );
+					console.log( { token: tokenData.token } );
 				} )
 				.catch( error => {
 					// eslint-disable-next-line no-console

2. Open/create a post.
3. Add a VideoPress block.
4. Add a Video to the block.
5. Save the post.
6. Re-open the post.
7. Observe that the token is shown in the console logs (i.e. {"token": "<TOKEN>").

[github-actions]

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bin/jetpack-downloader test jetpack rnmobile/videopress-fetch-token

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[github-actions]

Thank you for your PR!

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[SiobhyB]

Works great for me! I left one comment, but this is just a question for my own learning. @fluiddot, thank you for all your work on these set of PRs! 👏 👏 🙇‍♀️

I'd be happy to also approve the gutenberg and gutenberg-mobile PRs that this one relies on pending the discussion on the gutenberg one. 🙇‍♀️

[fluiddot]

@SiobhyB your PR review got dismissed when merging trunk into the PR. Would you mind re-approving it? Thanks 🙇 !

[SiobhyB]

@fluiddot, absolutely, re-approved :D