Integrating thrust into HPX

[adityacodes30]

This PR contains/will contain commits for integrating NVIDIA Thrust into HPX as part of the Google Summer of Code 2025 project.

Progress Checklist

Milestones

• Basic Thrust policy structure
• Initial algorithm dispatch is working (hpx::fill)

In Progress

• Additional algorithms

Any background context you want to provide?

Early stage implementation for HPX-Thrust integration. This provides the foundation for Thrust GPU-accelerated parallel algorithms through HPX

Checklist

• I have added a new feature and have added tests to go along with it.
• I have fixed a bug and have added a regression test.
• I have added a test using random numbers; I have made sure it uses a seed, and that random numbers generated are valid inputs for the tests.

[StellarBot]

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.06%	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (dcf267d)	194034	165080	85.08%
Head commit (4885a83)	193838 (-196)	165025 (-55)	85.14% (+0.06%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#6744)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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