Add IAsyncEnumerable support for OSLC Query

[Copilot]

OSLC Query API required manual pagination handling and lacked async support. This adds IAsyncEnumerable<T> to enable lazy, async iteration over query results with automatic pagination.

Changes

• OslcQuery.SubmitAsync<T>() - Returns IAsyncEnumerable<T> with internal lazy pagination; supports cancellation
• OslcQueryResult.NextPageAsync() - Async method for fetching subsequent pages
• Refactored OslcQueryResult constructors to reduce duplication

Usage

var query = new OslcQuery(client, capabilityUrl, queryParams);

await foreach (var resource in query.SubmitAsync<ChangeRequest>(cancellationToken))
{
    // Process resource - pages fetched lazily as needed
}

Original prompt

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This section details on the original issue you should resolve

<issue_title>Use IAsyncEnumerable for OSLC Query</issue_title>
<issue_description>Current API requires the querying to be done almost manually, does not support async, and is strictly chained (exposes paging nature of the OSLC Query API to the developer).

Instead, the desired state is to be able to run a query (async) and retrieve all results uniformly yet be lazy internally, refraining from unnecessarily eager pagination.

Relevant code locations:

• OSLC4Net.Client.Oslc.Resources.OslcQuery.Submit and OslcQueryResult.
• May also need to update OslcResponse &c. as per pagination LDP headers for any LDPC.

Additional considerations:

• Open-NET-Libraries/Open.ChannelExtensions may be useful
• Also see OslcQueryResult enumeration needs to be refactored #201 </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Use IAsyncEnumerable for OSLC Query #321

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