Preserve order of keys in JSON lists

[rubenvereecken]

Is your feature request related to a problem? Please describe.
I deal with JSON lists of objects, which I convert to CSV. The key order between the objects is consistent, yet in the output is random.

Describe the solution you'd like
We already have preserved key order for regular objects:

$ echo '{"z":1,"a":2,"c":3}' | dasel -r json -w csv
z,a,c
1,2,3

I would love to have the same feature for lists of objects – ie:

$ echo '[{"z":1,"a":2,"c":3},{"z":1,"a":2,"c":3}]' | dasel -r json -w csv                                                                                                                                                     
z,a,c
1,2,3
1,2,3

Instead, what currently happens is:

$ echo '[{"z":1,"a":2,"c":3},{"z":1,"a":2,"c":3}]' | dasel -r json -w csv                                                                                                                                                     
a,c,z
2,3,1
2,3,1

[TomWright]

This is only an issue when writing to CSV:

$ echo '[{"z":1,"a":2,"c":3},{"z":1,"a":2,"c":3}]' | dasel -r json
[
  {
    "z": 1,
    "a": 2,
    "c": 3
  },
  {
    "z": 1,
    "a": 2,
    "c": 3
  }
]
$ echo '[{"z":1,"a":2,"c":3},{"z":1,"a":2,"c":3}]' | dasel -r json -w yaml
- z: 1
  a: 2
  c: 3
- z: 1
  a: 2
  c: 3

More of a note to myself at the moment - hopefully I can better integrate the CSV parser in use.