Update DiffCmd to take in states to diff.

[azriel91]

Closes #101.

However, the output for diff-ing states from different profiles is not necessarily semantically meaningful.

Diff Output For Two Environments

Both not deployed

❯ ./envman diff demo_1 demo_2                                                                                                                                                                                                                 
# State Diffs

1. `app_download`    : resource does not exist on server, and `azriel91/web_app/0.1.1/web_app.tar` does not exist locally
2. `app_extract`     : files extracted and up to date
3. `iam_policy`      : does not exist as intended.
4. `iam_role`        : does not exist as intended.
5. `instance_profile`: does not exist as intended.
6. `s3_bucket`       : does not exist as intended.
7. `s3_object`       : does not exist as intended.

First not deployed, Second deployed

❯ ./envman diff demo_1 demo_2                                                                                                                                                                                                                 
# State Diffs

1. `app_download`    : `azriel91/web_app/0.1.1/web_app.tar` will change from 0 bytes to 6492160 bytes
2. `app_extract`     : extraction out of sync: 2 files added, 0 modified, 0 removed
3. `iam_policy`      : will be created.
4. `iam_role`        : will be created.
5. `instance_profile`: will be created.
6. `s3_bucket`       : will be created.
7. `s3_object`       : will be created.

First deployed, Second not deployed

❯ ./envman diff demo_2 demo_1                                                                                                                                                                                                                 
# State Diffs

1. `app_download`    : resource does not exist on server; locally `azriel91/web_app/0.1.1/web_app.tar` exists, but ensure will not delete it
2. `app_extract`     : extraction out of sync: 0 files added, 0 modified, 2 removed
3. `iam_policy`      : will be removed.
4. `iam_role`        : will be removed.
5. `instance_profile`: will be removed.
6. `s3_bucket`       : will be removed.
7. `s3_object`       : will be removed.

Both deployed

❯ ./envman diff demo_1 demo_2                                                                                                                                                                                                                 
# State Diffs

1. `app_download`    : `azriel91/web_app/0.1.1/web_app.tar` in sync with server
2. `app_extract`     : files extracted and up to date
3. `iam_policy`      : name changed from demo_1 to demo_2
4. `iam_role`        : name modified from demo_1 to demo_2. ⚠️ This modification requires deletion and recreation.
5. `instance_profile`: name changed from demo_1 to demo_2
6. `s3_bucket`       : name has changed from azriel-peace-envman-demo-1 to azriel-peace-envman-demo-2
7. `s3_object`       : bucket name has changed from azriel-peace-envman-demo-1 to azriel-peace-envman-demo-2

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03 🎉

Comparison is base (bc10df0) 92.24% compared to head (90c2f1d) 92.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
+ Coverage   92.24%   92.27%   +0.03%     
==========================================
  Files         277      277              
  Lines       20663    20668       +5     
==========================================
+ Hits        19060    19071      +11     
+ Misses       1603     1597       -6     

Impacted Files	Coverage Δ
crate/rt/src/cmds/diff_cmd.rs	100.00% <100.00%> (ø)
crate/rt_model/src/item_spec_wrapper.rs	84.72% <100.00%> (+2.04%)	⬆️
workspace_tests/src/item_specs/sh_cmd_item_spec.rs	96.27% <100.00%> (+0.04%)	⬆️
workspace_tests/src/item_specs/tar_x_item_spec.rs	99.50% <100.00%> (+0.01%)	⬆️
workspace_tests/src/rt/cmds/diff_cmd.rs	99.05% <100.00%> (+0.02%)	⬆️
workspace_tests/src/rt_model/item_spec_wrapper.rs	96.51% <100.00%> (ø)

... and 2 files with indirect coverage changes

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