Add option to pluck from custom Vue block

[jaschaephraim]

Description

• Adds support for graphql-tag-pluck to pluck raw GraphQL from a custom Vue block.
• Adds an option gqlVueBlock (defaults to undefined) to specify the name of the custom block. The feature has no impact if this option is not set.
• The parsing of Vue blocks is already being done by the Vue parser, so this requires no additional dependencies or algorithms.
• Includes a new test and small documentation update.
• Very minimal refactoring was done to keep DRY.

Related #4320

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Screenshots/Sandbox (if appropriate/relevant):

https://imgur.com/a/383F8uM

How Has This Been Tested?

• Unit test included in PR
• Fork currently in use in a personal project with graphql-codegen, see env info below

Test Environment:

• OS: Ubuntu
• NodeJS: v16.15.0
• @graphql-codegen/cli: v2.6.2
• @graphql-codegen/introspection: v2.1.1
• @graphql-codegen/typescript: v2.4.7
• @graphql-codegen/typescript-operations: v2.3.4
• @graphql-codegen/typescript-urql-graphcache: v2.2.8
• @graphql-codegen/typescript-vue-urql: v2.2.8

Checklist:

• I have followed the CONTRIBUTING doc and the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests and linter rules pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[changeset-bot]

🦋 Changeset detected

Latest commit: 6067ee6

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@graphql-tools/graphql-tag-pluck	Patch
@graphql-tools/code-file-loader	Patch
@graphql-tools/git-loader	Patch

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Name	Status	Preview	Updated
graphql-tools	✅ Ready (Inspect)	Visit Preview	May 4, 2022 at 10:29PM (UTC)

[ardatan]

Sorry for the late review! :) Thanks for the PR!