[TypeScript] Fix descriptor utility packaging and quick start

[teodordelibasic-db]

What changes are proposed in this pull request?

Fixes #389 by making loadDescriptorProto() usable directly from the installed npm package:

• publishes utils/descriptor.js and utils/descriptor.d.ts
• installs protobufjs as a runtime dependency of the package
• documents the .js subpath for CommonJS and native Node.js ESM and maps NodeNext resolution to the published declaration file
• requires a path boundary when matching proto filenames, preventing similarly suffixed files from being selected
• rewrites the README quick start around the published npm package and consumer-owned protobuf schemas and code-generation commands
• separates package-consumer instructions from source-development and repository-example workflows
• updates the leading ingestion examples to queue records and call flush() once

Previously, the npm package shipped only the TypeScript descriptor source, so Node.js could not import the documented utility. The protobuf walkthrough also mixed package-consumer steps with scripts and files that only exist in the source repository.

How is this tested?

Added three unit tests in typescript/test/unit.test.ts:

• verifies that the CommonJS helper loads and returns the requested DescriptorProto
• verifies that requesting air_quality.proto does not match a similarly suffixed file such as not_air_quality.proto
• packs the SDK, installs it in a clean temporary npm project, and verifies CommonJS loading, native ESM import, runtime dependency installation, tarball contents, and NodeNext type resolution