Add showing of `sha256` digest on `charmcraft resource-revisions`
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Current evaluation
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Issue body
### Bug Description
Sometimes, you want to find the full sha256 digest of a resource. In particular, to downgrade via `juju attach-resource`, e.g.:
```
juju attach-resource wordpress-k8s wordpress-image=registry.jujucharms.com/charm/600jll14kzaovquhnzyajwwvvcp8a6s1a2tgb/wordpress-image@sha256:f7e83e6005a30a12aa3a9aaa6c34aed2f008440290daead59ad825c7f2a43801
```
Unfortunately, `charmcraft resource-revisions` doesn't show this:
```
$ charmcraft resource-revisions wordpress-k8s wordpress-image
Revision Created at Size Architectures
119 2025-03-10T13:08:37Z 510B amd64
118 2025-03-10T10:27:21Z 510B amd64
117 2025-03-10T06:29:21Z 510B amd64
116 2025-02-10T08:28:55Z 510B amd64
115 2025-02-10T07:15:05Z 510B amd64
114 2024-12-04T16:57:57Z 510B amd64
113 2024-12-04T06:47:19Z 510B amd64
112 2024-12-03T13:25:47Z 510B amd64
111 2024-10-08T12:18:45Z 510B amd64
110 2024-10-07T13:36:24Z 510B amd64
109 2024-09-19T15:44:48Z 510B amd64
108 2024-09-17T18:16:30Z 510B amd64
...
```
### To Reproduce
charmcraft resource-revisions wordpress-k8s wordpress-image
### Environment
$ charmcraft version
charmcraft 3.4.3.post53+gc4d43add
### charmcraft.yaml
```yaml
N/A
```
### Relevant log output
```shell
N/A
```
Evaluation history
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