Modal updates Volumes v2, JavaScript and Go SDKs to beta

Modal has released Volumes v2 in open beta for all apps, with a filesystem rebuilt for higher throughput, faster random access, and true high-concurrency writes from hundreds of containers, plus no cap on stored files. Its JavaScript/TypeScript and Go SDKs also entered beta at v0.5, adding a unified Client object and support for Sandboxes, Functions, Images, and Volumes.