Replace jshint by eslint

jshint does not seem to be active anymore: https://github.com/jshint/jshint/commits/main/ And it is blocking the usage of new ES feature like https://foss.heptapod.net/tryton/tryton/-/jobs/2325161

So I propose to switch to eslint which looks like being actively maintained. The switch should be done in two steps:

• setup a configuration and exclude failing rules that are not critical (and fix critical one) to be back-ported
• clean the source code to stop exclude rules for default branch only