Add intelligent Blaze campaign defaults

[j6ll]

Summary

• infer campaign intent from target type and natural-language goal
• return conservative lower/recommended/higher budget options when budget or duration is omitted
• expose intent, assumptions, recommendations, and budget options in the prepare-campaign output schema

Tests

• composer phpunit -- tests/php/Campaign_Preparer_Test.php tests/php/abilities/Blaze_Abilities_Test.php

[github-actions]

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bin/jetpack-downloader test jetpack add/ads-1037-intelligent-defaults

bin/jetpack-downloader test jetpack-mu-wpcom-plugin add/ads-1037-intelligent-defaults

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[github-actions]

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[jp-launch-control]

Code Coverage Summary

Cannot generate coverage summary while tests are failing. 🤐

Please fix the tests, or re-run the Code coverage job if it was something being flaky.

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