feat(kvstoreentry): Support for missing CRUD attributes

[rcaril]

All Submissions:

New Feature Submissions:

• Does your submission pass tests?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your core changes, as applicable?
• Have you successfully run tests with your changes locally?

User Impact

• New get command that only provides the value of a key
• Updated the describe to now only provide the attributes of a key, rather than the value of a key itself

Are there any considerations that need to be addressed for release?

The following features are now supported:

Create:

• add
• append
• prepend
• metadata
• if_generation_match
• background_fetch

Delete

• if_generation_match
• force

Describe

• if_generation_match
• metadata

Get

• if_generation_match

Tests:

 make test TEST_ARGS="-run TestCreateCommand ./pkg/commands/kvstoreentry/"
ok      github.com/fastly/cli/pkg/commands/kvstoreentry 1.105s

make test TEST_ARGS="-run TestGetCommand ./pkg/commands/kvstoreentry/"
ok      github.com/fastly/cli/pkg/commands/kvstoreentry 1.083s

 make test TEST_ARGS="-run TestDescribeCommand ./pkg/commands/kvstoreentry/"
ok      github.com/fastly/cli/pkg/commands/kvstoreentry 1.069s

make test TEST_ARGS="-run TestDeleteCommand ./pkg/commands/kvstoreentry/"
ok      github.com/fastly/cli/pkg/commands/kvstoreentry 1.103s

[rcaril]

Will update CHANGELOG tomorrow.

[philippschulte]

Overall this is a solid implementation. Please keep in mind that this introduces a breaking change for anyone who previously used fastly kv-store-entry describe -k foo -s bar to get the value. Please make sure to state it properly in the changelog. Please add the link to the docs in the PR description. Thank you!

[kpfleming]

Some minor changes to make but overall this looks great!