prettier-plugin-hermes-parser: error with prettier when declare namespace

## Bug Description

Prettier fails if the code contains `declare namespace`

```
[error] flow-typed/zipkin_vx.x.x.js: Error: Missing visitor keys for 'DeclareNamespace'.
[error] at getVisitorKeys3 (~/web/node_modules/prettier-plugin-hermes-parser/dist/third-party/internal-prettier-v3/plugins/estree.js:1236:29)
[error] at ~/web/node_modules/prettier-plugin-hermes-parser/dist/third-party/internal-prettier-v3/ast-to-doc.js:1162:44
...
```

Library module:

```
declare module 'zipkin' {
declare namespace sampler {
declare const neverSample: () => boolean;
}
}
```