Accept array of from and to on Edge requests

There are some cases that user may want to insert/update/delete all adjacent edges from single from vertex.

for example, current implementation require use to provide following json payload.

[
  {"timestamp": 10, "from": 1, "to": 10, "label": "test", "props": {}},
  {"timestamp": 10, "from": 1, "to": 11, "label": "test", "props": {}}
]

it would be helpful to provide below.

[
  {"timestamp": 10, "from": 1, "tos": [10, 11], "label": "test", "props": {}}
]

Of course there is limit on this. it can only be used when all fields are same except either `from` or `to`.