feat: add item coverage and asset management in DataClient

[wiki0831]

The changes focus on improving item assessment(item-get,item-coverage), asset management(asset-get, asset-list) and making the API more consistent.

1. implementations:

• item-get: new in Async client, Sync Client, CLI
• item-coverage: new in Async client, Sync Client, CLI
• asset-get: new(un-commented) in CLI
• asset-list: new in CLI

2. tests

• added async, sync, and cli test for the new implementations

4. doc updates:

• docs/cli/cli-data.md
• design-docs/CLI-DATA.md
  • align parameter order with ITEM_TYPE, ID convention (few examples are out-of-date and no longer work)

[ischneider]

looks good so far!

one thing we've been trying to do w/ tests is combine the sync/async calls into a single case since the setup and assertions are the same, the only difference is in invocation... see tests/integration/test_features_api.py for an example of this (and no reason to clean up existing tests, more to stop proliferation of new cases)

[wiki0831]

looks good so far!

one thing we've been trying to do w/ tests is combine the sync/async calls into a single case since the setup and assertions are the same, the only difference is in invocation... see tests/integration/test_features_api.py for an example of this (and no reason to clean up existing tests, more to stop proliferation of new cases)

thanks @ischneider yes I agree, writing double the test is kinda tedious.

I was just trying to follow the existing pattern.

This should go into a separate PR. here is an issue for this: https://github.com/planetlabs/planet-client-python/issues/1110