26040: Detect compute limitations/configurations - MINOR

[mkoistinen]

Add checks for situations where the available compute may be different than accessible compute and CPU affinity/visibility checks to installation_verification. These are always warnings, never errors and are meant to head off complicated diagnosis of poor performance caused by customer hardware configurations.

• Split installation_verification.py (~2,000 lines) into a package of focused modules; the package now exports only main. The supported interfaces are unchanged: the verify_howso_install console script and python -m howso.utilities.installation_verification
• Add check_low_priority_compute ("Python: Low-priority CPU access"): warns if invoked below Normal priority, since the comparison is meaningless from there; otherwise compares throughput and CPU affinity against a child process created below Normal priority. Windows only
• Add check_usable_cpus ("Python: Usable CPUs"): warns when the process may use fewer CPUs than the system reports, from an affinity mask, a cpuset, or Windows confining a process to one processor group. Windows and Linux
• Add check_cpu_steal ("Python: CPU steal time"): reports CPU time taken by a hypervisor, warning above 10%. Linux only, and silent on bare metal
• Add check_visible_cores ("Howso Client: Visible CPUs"): reports the CPU count Python and Howso Engine™ each see, and warns when they disagree — usually a max_num_threads value set in the Howso configuration
• Suppress the client's own progress rendering for the duration of the checks, including inside spawned child processes, which do not inherit it
• Fall back from "™" to "(tm)" where the console cannot render it, applied at the output funnels so every message is covered
• Refer to "Howso Engine™" rather than "the Engine" in user-facing messages
• Promotes "Howso™" -> "Howso®" and handles the fallbacks
• Fix check_latency defaults so the NOTICE branch is reachable
• Add a timeout to the tzdata child; drop its unreachable result is None branch
• Import requests ConnectionError under an alias; stop shadowing the builtin
• Modernize annotations: PEP 604 unions, direct typing imports
• Make log timestamps tz-aware; use time.monotonic() for the sampling deadline
• Add tests/test_installation_verification.py (83 tests)

All unit tests (old and new pass). Also tested the new functionality on a real Windows Server 2022 and verified functionality (except the one that requires more than 64 cores).