Mattermost-server: Support plugin pagination in the Plugin Marketplace

[lieut-data]

Update the webapp and server to support pagination of plugins in the plugin marketplace. Note that the server should still consume the entire plugin result set from the upstream Plugin Marketplace: pagination should only occur client-side relative to the Mattermost server.

See the following mockup (ignore the button on the left) to illustrate how it shoud look:

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JIRA: https://mattermost.atlassian.net/browse/MM-17546

[kosgrz]

Hi, I can do it. It should have a fixed number of results per page (50) or it should be customizable?

[lieut-data]

Thanks, @kosgrz! I don't think the enduser should be able to configure this, but let's absolutely define a client-side constant that makes it possible to tweak this in the code. I'd suggest perhaps 15 at a time?

[jasonblais]

Hey @kosgrz, let us know if you have any questions so far, we'd be happy to help. Thanks so much for your interest on this :)

[kosgrz]

Hey @jasonblais! Sorry for the delay. I've just created a PR for this issue: https://github.com/mattermost/mattermost-webapp/pull/4567