RFC: change release cadence

## Context

At the moment, Wave releases a new version on every pull request merge.

Recently, the number of pull requests has increased and often we merge several PRs within one day. This means that sometimes we publish several minor versions per day. It makes a lot of noise and it is harder to spot what change has happened.

## Proposal

Implement "one day - one release" policy. That means that releases are scheduled (e.g. midnight every day) and the release contains all the merged PRs on the day of release.

* if I merged any number of PRs today, the release will take place 23:59 the same day containing both changes merged
* if no PRs were merged, no release

## Risks

* We may want to release a new version as fast as possible. _Solution_: we trigger release manually or using manually triggered Github Action