Returns a list of all calendars you can access.
{
"calendars":{
"public-calendars":[
{
"id":"54904646",
"name":"A Calendar",
...
},
{
"id":"43907176",
"name":"Another calendar",
...
},
...
],
"your-calendars":[
{
"id":"34263375",
"name":"Birthdays",
...
},
...
],
"others-calendars":[
{
"id":"42633755",
"name":"Public calendar",
...
},
...
]
}
}