(Yarn PnP) Add react-transition-group as optional peer dependency

[blutorange]

When using Yarn PnP with e.g. webpack it results in an error because primereact attempts to import react-transition-group, but does not declare it in its dependencies. Yarn PnP requires that a package explicitly declares all packages it uses.

When it should not be a normal dependency, it needs to be declared as an optional peer dependency in the package.json:

{
  "peerDependencies": {
    "react-transition-group": "^4.4.1"
  },
  "peerDependenciesMeta": {
    "react-transition-group": {
      "optional": true
    }
  }
}

For reference, this is the kind of error yarn produces otherwise:

ERROR in ../../.yarn/__virtual__/primereact-virtual-f9a9246cfb/6/.yarn/berry/cache/primereact-npm-6.6.0-aedbba0e88-8.zip/node_modules/primereact/core/core.esm.js 4:0-74
Module not found: Error: Can't resolve 'react-transition-group' in '/home/user/git/xxx/src/main/web/.yarn/__virtual__/primereact-virtual-f9a9246cfb/6/.yarn/berry/cache/primereact-npm-6.6.0-aedbba0e88-8.zip/node_modules/primereact/core'
resolve 'react-transition-group' in '/home/user/git/xxx/src/main/web/.yarn/__virtual__/primereact-virtual-f9a9246cfb/6/.yarn/berry/cache/primereact-npm-6.6.0-aedbba0e88-8.zip/node_modules/primereact/core'
  Parsed request is a module
  using description file: /home/user/git/xxx/src/main/web/.yarn/__virtual__/primereact-virtual-f9a9246cfb/6/.yarn/berry/cache/primereact-npm-6.6.0-aedbba0e88-8.zip/node_modules/primereact/core/package.json (relative path: .)
    Field 'browser' doesn't contain a valid alias configuration
    resolve as module
      request is not managed by the pnpapi
        primereact tried to access react-transition-group, but it isn't declared in its dependencies; this makes the require call ambiguous and unsound.
        Required package: react-transition-group
        Required by: primereact@virtual:b16796768ff87ddbece8b5bfc2039947cf3d8f163bc361bdb6f4a0bde13eb62e363041c182c4733efb250df91f2786b239ed15e45ee9b2a3a3c47ac3fd60a649#npm:6.6.0::__archiveUrl=https%3A%2F%2Fartifactory.xima-services.de%3A443%2Fartifactory%2Fapi%2Fnpm%2Fnpm-fs%2Fprimereact%2F-%2Fprimereact-6.6.0.tgz (via /home/user/git/xxx/src/main/web/.yarn/__virtual__/primereact-virtual-f9a9246cfb/6/.yarn/berry/cache/primereact-npm-6.6.0-aedbba0e88-8.zip/node_modules/primereact/core/)
 @ ../../.yarn/__virtual__/primereact-virtual-f9a9246cfb/6/.yarn/berry/cache/primereact-npm-6.6.0-aedbba0e88-8.zip/node_modules/primereact/inputtext/inputtext.esm.js 2:0-86 160:8-28 169:26-44 177:43-62 177:94-116 222:21-24 231:22-32 235:23-47
 @ ./src/script/components/form-store-header.tsx 4:0-49 7:78-87
 @ ./src/script/components/form-store.tsx 4:0-54 10:151-166
 @ ./src/script/render.ts 4:0-52 27:25-34
 @ ./src/index.ts 21:0-32 21:0-32

[melloware]

Can you review my PR I submitted please?

[blutorange]

@melloware Yes, that looks fine to me. This should make yarn happy.