Levitate: move to ESM

[leventebalogh]

Related: grafana/plugin-tools#654

The problem

We have dependencies in the project (e.g. ora and execa) which we cannot update to because they are ESM only packages and current build tooling doesn't support them.

Possible solution

Build Levitate as an ESM package. (It shouldn't be a breaking change for node LTS).

[tolzhabayev]

Can you add more as to what and why, do we expect someone who is using it to change anything (e.g.)? @leventebalogh

[leventebalogh]

Sure thing @tolzhabayev, good point!

I think in Grafana we are using Node v20, so it shouldn't be an issue. Regarding support I think it's fine to support the same node versions as @grafana/plugin-tools - however I will check where else levitate is used in our ecosystem to see if we don't break anything.