Add orders_nanpa example

[Fivell]

Summary

• Adds OrdersNanpaExample showing how to order a DID number by NPA/NXX prefix
• Fixes pre-existing compile errors in other examples (BalanceExample, VoiceInTrunkGroupsExample, DidTrunkAssignmentExample, IdentityAddressProofsExample)
• Updates examples/README.md with new example entry

Test plan

• Run DIDWW_API_KEY=... ./gradlew runExample -PexampleClass=com.didww.examples.OrdersNanpaExample against sandbox
• Verify all examples compile without errors

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull request overview

Adds a new Java example demonstrating how to order a DID by NANPA NPA/NXX prefix, while also updating several existing examples to align with the current SDK resource construction patterns (removing now-nonexistent *.build(id) usage) so the examples compile cleanly.

Changes:

• Added OrdersNanpaExample to demonstrate ordering by NANPA prefix via nanpa_prefix_id.
• Updated multiple examples to use SDK resources directly (and withId(...) where applicable) instead of removed build(...) helpers.
• Documented the new example in examples/README.md.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
examples/src/main/java/com/didww/examples/VoiceInTrunkGroupsExample.java	Updates trunk-group relationship assignment to use the created trunk objects directly.
examples/src/main/java/com/didww/examples/OrdersNanpaExample.java	New example: look up a NANPA prefix and place a DID order using the resolved SKU + nanpa_prefix_id.
examples/src/main/java/com/didww/examples/IdentityAddressProofsExample.java	Replaces removed build(...) helpers with direct resources / withId(...) for proof file relationships.
examples/src/main/java/com/didww/examples/DidTrunkAssignmentExample.java	Uses new <Resource>().withId(...) for patch/update payloads and relationships.
examples/src/main/java/com/didww/examples/BalanceExample.java	Fixes type mismatch by formatting BigDecimal balances directly.
examples/README.md	Adds an entry for OrdersNanpaExample.

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