HPCC-30579 Retrieve remote storage targets in ESP FileSpray

[wangkx]

1. Move the code for checking the allowForeign from the ws_dfsclient lib into the dali lib so that it can be used by the ws_fs lib.
2. Add new ESP FileSpray method GetRemoteTargets.

Type of change:

• This change is a bug fix (non-breaking change which fixes an issue).
• This change is a new feature (non-breaking change which adds functionality).
• This change improves the code (refactor or other change that does not change the functionality)
• This change fixes warnings (the fix does not alter the functionality or the generated code)
• This change is a breaking change (fix or feature that will cause existing behavior to change).
• This change alters the query API (existing queries will have to be recompiled)

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• My code follows the code style of this project.
  • My code does not create any new warnings from compiler, build system, or lint.
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  • I have updated the documentation accordingly, or...
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  • I have addressed them here
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Testing:

[github-actions]

https://track.hpccsystems.com/browse/HPCC-30579
Jira updated

[jakesmith]

@wangkx - looks good, but it would be good if this functionality was in 9.4, can you retarget to 9.4.x ?

[wangkx]

@jakesmith I thought I targeted to 9.4.x. My mistake... Now, it is targeted to 9.4.x.

[jakesmith]

@wangkx - looks fine.

[wangkx]

@ghalliday please merge