feat: Add TestCase utility for configuring insta settings

[spencewenski]

Add some utilities to set some common insta settings. The settings are configurable using the TestCaseConfig builder struct. The builder yields a TestCase struct containing the configured insta settings.

The settings available to configure currently are:

1. Redact UUIDs from snapshots; UUIDs are replaced with the string [uuid]
2. Set the suffix of the snapshot (which can be provided manually or automatically based on the thread name). This is useful when using insta along with rstest.
3. Auto-bind to the current scope on creation of the TestCase struct to avoid the need to remember to bind the settings scope.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.99%. Comparing base (23be615) to head (31abc0a).

Files	Coverage Δ
src/api/cli/mod.rs	77.22% <ø> (ø)
src/config/app_config.rs	40.35% <ø> (ø)
src/config/auth/mod.rs	100.00% <ø> (ø)
src/config/database/mod.rs	89.28% <ø> (ø)
src/config/health_check/mod.rs	100.00% <ø> (ø)
src/config/service/http/default_routes.rs	100.00% <ø> (ø)
src/config/service/http/initializer.rs	100.00% <ø> (ø)
src/config/service/http/middleware.rs	100.00% <ø> (ø)
src/config/service/mod.rs	100.00% <ø> (ø)
src/config/service/worker/sidekiq/mod.rs	83.33% <ø> (ø)
... and 10 more

... and 12 files with indirect coverage changes

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