graphql-tools Adding support for module import paths

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Description

This change adds support for #import statements to use paths to modules.

Example:

# import A from "require:someModule/schema.graphql"

A simplified form, assuming the module package main points at a schema could be:

# import A from "require:someModule"

This is particularly useful for both published shared types and monorepos that wish to avoid relative paths between packages.

Related: https://github.com/ardatan/graphql-tools/discussions/4721

Please delete options that are not relevant.

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

See import-schema.spec.ts test: "require paths"

Test Environment:

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