Add RPC, Filter Validation helpers to `NtCoreLib.Net.Firewall` and PoSH module#85

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jcspencer wants to merge 8 commits intogoogleprojectzero:mainfrom

jcspencer:firewall_rpc_improvements

Commits on Sep 14, 2025

Add provider/sublayer creation support to `NtCoreLib.Net.Firewall`
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Add support for more WFP RPC types, including including new `FWPM_CONDITION_RPC_OPNUM` condition.
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Updates `NamedGuidDictionary` for WPF to use reflection against static `Guid` values in respective classes, keeping values consistent.
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Adds support for getting/setting the context value of WPF filter objects.
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Fix handling of RPC values in `FirewallValue.SpecializeValue`
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Adds mechanism to dynamically validate filter conditions against layers, which report field presence and basic type metadata.
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Add `ValidateWithLayer` helper to FirewallFilterBuilder to validate all conditions dynamically.
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Add PowerShell helpers for firewall filtering with RPC, and filter condition validation support
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