feat(deployments): add Image Size to the list of deployments

[EtienneM]

 emichon@biniou  ~/Documents/Scalingo/golang/src/github.com/Scalingo/cli   fix/889/deployment_image_size  go run ./scalingo --app biniou deployments              
+--------------------------------------+---------------------+----------+----------+------------------------------------------+---------------+------------+
|                  ID                  |        DATE         | DURATION |   USER   |                 GIT REF                  |    STATUS     | IMAGE SIZE |
+--------------------------------------+---------------------+----------+----------+------------------------------------------+---------------+------------+
| 36998cd8-8b30-47b3-b32f-78b16c3ad389 | 2023/02/16 14:55:13 | 37s      | etiennem | c7f635be3924e4b5c2aee7b56338ab19522769eb | success       | 6.4 MiB    |
| d3723dee-420d-42a7-8c8a-25224b2a7074 | 2023/02/16 14:52:43 | 32s      | etiennem | 41c8afdf922b6e59585ab0e6cf98f7ea3b14716d | success       | 6.4 MiB    |
| e4483723-2ba6-42d8-9bdb-d0b1f80344eb | 2023/02/16 14:51:17 | 49s      | etiennem | d6086968d7b43187f789383c3e175c19dd15f009 | success       | 6.4 MiB    |
| f8d1db94-6074-4dc4-a1a1-b3d478410a5b | 2023/02/15 08:28:10 | 1m29s    | etiennem | fc694bcf6a39ce3e1f56561cb38157c0c299b54b | success       | 361 MiB    |
| 3d22ccbf-d22c-4d2a-9d47-e3e821536c22 | 2023/02/14 16:01:57 | 5m0s     | etiennem | ee47c6ce5dc7a706cdf206370a3af61b8bbfdf8f | crashed-error | 1.0 GiB    |
| 0f7cd3e3-d244-402e-8f1b-fd0535e9db04 | 2023/02/14 15:54:31 | 4m6s     | etiennem | 3e9db89142e6e452d7e5dc041e45946542499596 | crashed-error | 1.0 GiB    |
| 6167c80e-fbe9-4afc-b8f4-a7046604cdba | 2023/02/14 15:48:59 | n/a      | etiennem | 25949c8166f8bbf5ab409526ec7c01355ece6dbd | build-error   | 1.0 GiB    |
+--------------------------------------+---------------------+----------+----------+------------------------------------------+---------------+------------+

Fix #889

Stale, waiting for the release of go-scalingo including Scalingo/go-scalingo#306

• Add a changelog entry in the section "To Be Released" of CHANGELOG.md