General cleanup and improvement

Author: ardatan

.changeset/chilly-avocados-kiss.md

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+---
+'@graphql-tools/code-file-loader': patch
+---
+
+enhance(code-file-loader): remove extra work on loader level

.changeset/chilly-seals-smell.md

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+---
+'@graphql-tools/module-loader': minor
+---
+
+feat(module-loader): check if module exists using FS

.changeset/empty-pugs-wash.md

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+---
+'@graphql-tools/apollo-engine-loader': minor
+---
+
+feat(apollo-engine): add sync support

.changeset/gentle-buckets-dress.md

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+---
+'@graphql-tools/url-loader': patch
+---
+
+enhance(url-loader): avoid doing extra work on loader level

.changeset/gold-rabbits-fly.md

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+---
+'@graphql-tools/github-loader': minor
+---
+
+feat(github-loader): handle SDL correctly on loader level

.changeset/rare-apes-wash.md

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+---
+'@graphql-tools/json-file-loader': patch
+---
+
+enhance(json-file-loader): check for path in a safer way

.changeset/smart-donuts-care.md

@@ -1,5 +1,5 @@
 ---
-'@graphql-tools/utils': minor
+'@graphql-tools/utils': patch
 ---
 
-enhance(utils): refactor and cleanup
+enhance(utils): refactor, cleanup and remove extra work

.changeset/unlucky-pumpkins-burn.md

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+---
+'@graphql-tools/merge': patch
+---
+
+fix(merge): handle schema definitions correctly