ci: add renovate configuration

[alan-agius4]

Since we have a lot of pin dependencies renovate will help us automate dependency updates.

[clydin]

We should probably exclude all package.json templates inside schematic packages

[alan-agius4]

Actually, I don't think it's needed, as the templates are not valid package.json files. Ie, npm outdated cannot be executed against these files.

[alexeagle]

could you add some scheduling for it? otherwise it will send us a large volume of little PRs for each dep that publishes an update, which takes our time and CI resources

[alan-agius4]

@alexeagle I add a rate limiting of 2 PR / hour. and scheduled it run between 10pm - 4am every weekday (Pacific Time US) and run freely during the weekends.

[alexeagle]

I don't think this scheduling actually improves it, we can still get 12 PR's per day. I'd rather get one PR a week or so. But let's try this and see how it works.

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