add endpoint for influence struggle, where we choose who turn first in that phase

[CHeMeS]

• as query
• check has_priority on back, if not - raise error (what a error)

#133

this is in influence struggle

[CHeMeS]

1. Suggestion. Add in to player schema after "has_priority":
   "has_turn_first": {
   "title": "Priority for briefing phase",
   "type": "boolean"
   },

2. Suggestion. Add in to api/v1/game/next endpoint after "phase":
   {
   "required": false,
   "schema": {
   "title": "Turn first in briefing phase",
   "enum": [
   "push"
   ],
   "type": "boolean"
   },
   "name": "has_turn_first",
   "in": "query"
   }

3. 409 error (Conflict)

[Konstantin Kl.]

it is balance setting - is makes in previous phase