Add hosting parameter support for Orders API

[pl-gideon]

Related Issue(s):

Closes # https://github.com/planetlabs/planet-client-python/issues/1042

Proposed Changes:

For inclusion in changelog (if applicable):

1. Hosting parameter can be specified in the SDK / CLI when making Orders API requests.

Not intended for changelog:

Diff of User Interface

Old behavior: No support for hosting parameter.

New behavior: Hosting parameter can be specified in the SDK / CLI when making Orders API requests.

PR Checklist:

• [x] This PR is as small and focused as possible
• [x] If this PR includes proposed changes for inclusion in the changelog, the title of this PR summarizes those changes and is ready for inclusion in the Changelog.
• [x] I have updated docstrings for function changes and docs in the 'docs' folder for user interface / behavior changes
• [x] This PR does not break any examples or I have updated them

(Optional) @mentions for Notifications: @asonnenschein

[asonnenschein]

LGTM! Don't forget to add an entry to https://github.com/planetlabs/planet-client-python/blob/main/CHANGES.txt.

[pl-gideon]

@asonnenschein added to the cli docs 👍