feat(distributions): mark exportMode and fileIds as deprecated in AddDistributionRequest

[Copilot]

The Crowdin API has marked exportMode and fileIds as deprecated parameters on the Add Distribution endpoint. The SDK should surface this to consumers at compile time.

Changes

• AddDistributionRequest: Added [Obsolete(MessageTexts.DeprecatedProperty)] to ExportMode and FileIds properties, matching the convention used in AddProjectMemberRequest, AddTeamToProjectRequest, etc.

// Both properties now emit CS0618 obsolete warnings at the call site
var request = new AddDistributionRequest
{
    Name = "My Distribution",
    ExportMode = DistributionExportMode.Default, // ⚠️ deprecated
    FileIds = new[] { 1L, 2L },                 // ⚠️ deprecated
    BundleIds = new[] { 3L },
};

Backward compatibility is preserved — the properties remain functional, only a compiler warning is emitted.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Mark deprecated Distribution create params</issue_title>
<issue_description>The Crowdin API marks exportMode and fileIds request parameters in the Add Distribution method as deprecated.

The Crowdin API client libraries should be updated to mark these parameters as deprecated in SDK method signatures, so developers are clearly guided away from using them while keeping backward compatibility.

References:

• Add Distribution</issue_description>

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

• Fixes Mark deprecated Distribution create params #361

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