feat(vite-plugin-angular): add tsTransformers config

[ch1ffa]

Add configuration to allow custom TypeScript transformers to be added

Closes #210

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/analogjs/analog/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

Which package are you modifying?

• vite-angular-plugin
• astro-angular
• create-analog
• router
• platform
• content

What is the current behavior?

There is no way to add a custom TypeScript transformer

Issue Number: #210

What is the new behavior?

Added config parameter which allows to add a custom transformer to before array

import { defineConfig } from 'vite';
import analog from '@analogjs/platform';

// https://vitejs.dev/config/
export default defineConfig(() => {
  return {
    plugins: [
      analog({
        advanced: {
          tsTransformers: [customTransformer]
        }
      })
    ]
  };
});

Does this PR introduce a breaking change?

• Yes
• No

Other information

I tested changes on a small application that uses a transformer from https://github.com/morrys/ts-relay-plugin

Everything works as expected but I'm not sure should we add a test or an example app here.

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[brandonroberts]

Nice work!

[brandonroberts]

Thanks! @allcontributors add @ch1ffa for code

[allcontributors]

@brandonroberts

I've put up a pull request to add @ch1ffa! 🎉