[client-preset] allowed options and defaults

This issue is the place to discuss allowed options and default values when using the `preset: 'client'` setup.

## Currently supported options

- `scalars`
- `strictScalars`
- `namingConvention`
- `useTypeImports`
- `skipTypename`
- `enumsAsTypes`
- `arrayInputCoercion`
- `presetConfig.fragmentMasking`
- `presetConfig.gqlTagName`
- `presetConfig.unmaskFunctionName`
- `emitLegacyCommonJSImports`

## Requested options support
- `nonOptionalTypename` https://github.com/dotansimha/graphql-code-generator/pull/8702 - [Request](https://github.com/dotansimha/graphql-code-generator/issues/8296#issuecomment-1287010974)
- `immutableTypes` https://github.com/dotansimha/graphql-code-generator/pull/10459 - [Request](https://github.com/dotansimha/graphql-code-generator/issues/8296#issuecomment-1287010974)

## Current defaults
- `presetConfig.fragmentMasking: true`
- `inlineFragmentTypes: true` (if fragment masking is enabled)
- `emitLegacyCommonJSImports: true`
- `inputMaybeValue: T | null | undefined`

## Requested defaults
- `ignoreNoDocuments: true` (@charlypoly)
- should `presetConfig.fragmentMasking` be `false` by default? (@charlypoly)
- `dedupeFragments: true` (https://github.com/dotansimha/graphql-code-generator/issues/8103#issuecomment-1298692748)
- `enumsAsTypes: true` (@n1ru4l)