feat: Add flagsmith_feature and flagsmith_segment data sources

[matthewelwell]

Closes #153.

Adds data sources so features and segments created outside of Terraform can be referenced. Without them, a pipeline that manages only environment-specific flagsmith_feature_state overrides has no way to get at the feature it needs to override — the use case in the issue.

data "flagsmith_feature" "my_feature" {
  uuid = "10421b1f-5f29-4da9-abe2-30f88c07c9e8"
}

data "flagsmith_segment" "mobile_users" {
  uuid = "f6c714d3-94e7-4b14-9117-8dd9db91bc19"
}

resource "flagsmith_feature_state" "mobile_override" {
  feature_id       = data.flagsmith_feature.my_feature.id
  environment_key  = var.environment_key
  segment_id       = data.flagsmith_segment.mobile_users.id
  segment_priority = 0
  enabled          = true
  feature_state_value = {
    type         = "unicode"
    string_value = "mobile-value"
  }
}

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📝 Walkthrough

Walkthrough

Added flagsmith_feature and flagsmith_segment Terraform data sources. Each data source reads a Flagsmith object by UUID and writes computed attributes to state. Segment support includes nested rules and conditions. The provider registers both data sources. Acceptance and schema consistency tests cover successful reads, missing objects, nested data, and feature-state usage. Documentation, examples, and an Unreleased changelog entry were added.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: ⚪ Minimal · up to 8f080

The PR adds the requested data sources; the only noted issue is a minor changelog formatting problem that does not affect runtime behavior. It is otherwise merge-ready after normal review, with a small documentation fix recommended.

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Actionable comments posted: 1

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: d9d1f3fa-4664-4cdd-9033-840e3ff91674

📥 Commits

Reviewing files that changed from the base of the PR and between efa883e and 8f080f2.

📒 Files selected for processing (11)

• CHANGELOG.md
• docs/data-sources/feature.md
• docs/data-sources/segment.md
• examples/data-sources/flagsmith_feature/data-source.tf
• examples/data-sources/flagsmith_segment/data-source.tf
• flagsmith/data_source_feature.go
• flagsmith/data_source_feature_test.go
• flagsmith/data_source_schema_test.go
• flagsmith/data_source_segment.go
• flagsmith/data_source_segment_test.go
• flagsmith/provider.go

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