Add Google Play payment API to gRPC

[MarkusPettersson98]

This PR exposes the Google Play payment via gRPC 🚀

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This change is 

[linear]

DES-796 Add play payment api to gRPC

[dlon]

Reviewed 5 of 5 files at r1, 1 of 1 files at r2, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @MarkusPettersson98)

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mullvad-jni/src/lib.rs line 311 at r1 (raw file):

        let event_listener = match runtime
            .block_on(async { spawn_management_interface(command_channel.sender()) })

Not relevant to the PR but this needs to be... improved. Pretty sure it was just a hack to get things to work. 😂

[MarkusPettersson98]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @dlon)

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mullvad-jni/src/lib.rs line 311 at r1 (raw file):

Previously, dlon (David Lönnhager) wrote…

Not relevant to the PR but this needs to be... improved. Pretty sure it was just a hack to get things to work. 😂

😂 🤷

[MarkusPettersson98]

AFAICT build errors seem to come from the base branch itself, and not my changes 🤷

[dlon]

Reviewed 1 of 1 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved

[Pururun]

Reviewed all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved

[MarkusPettersson98]

Closing this PR - the has been cherry-picked into the base branch!