[REF] html_editor: clean the resource API for plugins

[Goaman]

This commit change the resource API for the plugins in 3 ways.

1) The disposal of resources

Instead of

class MyPlugin extends Plugin {
    /** @type { (p: MyPlugin) => Record<string, any> } */
    static resources = (p) => ({
        my_handlers: p.handler.bind(p)
    })
}

We now have

class MyPlugin extends Plugin {
    resources = {
        my_handlers: this.handler.bind(this)
    }
}

2) Resource getter

To access a specific resource within a plugin, instead of

this.resources['my_handler']

We now have

this.getResource('my_handler')

If no other plugin disposed the specified resource, the getter will return an empty array.

3) Sequences for all resources

This commit give the ability to specify a sequence for any resource item, removing the need for the consumer of the resource to have to setup it.

Instead of

class MyPluginA extends Plugin {
    resources = {
        my_handlers: {handler: this.handler.bind(this), sequence: 100}
        my_data: {id: 'some-id', sequence: 100}
    }
}
class MyPluginB extends Plugin {
    constructor() {
        this.handlers = this.getResource('my_handlers')
            .sort((a, b) => a.sequence - b.sequence)
    }
    myMethod() {
        for (const {handler} of this.myHandlers) {
            handler();
        }
    }
}

We now have

class MyPluginA extends Plugin {
    resources = {
        my_handlers: withSequence(100, this.handler.bind(this)),
        my_data: withSequence(100, {id: 'some-id'}),
    }
}
class MyPluginB extends Plugin {
    myMethod() {
        for (const handler of this.getResource('my_handlers')) {
            handler();
        }
    }
}

---

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[robodoo]

[robodoo]

@goaman @fdardenne 'ci/runbot' failed on this reviewed PR.

[fdardenne]

@robodoo r+

[fdardenne]

@robodoo r+