chore: export config constants and refactor exports

[tatomyr]

What/Why/How?

• Exported all from config/constants.ts
• Removed usage of new Config in the code (it's going to be exported only as a type)
• Regrouped exports for better readability

Check yourself

• Code changed? - Tested with Redoc/Realm/Reunite (internal)
• All new/updated code is covered by tests
• New package installed? - Tested in different environments (browser/node)
• Documentation update considered

Security

• The security impact of the change has been considered
• Code follows company security practices and guidelines

[changeset-bot]

⚠️ No Changeset found

Latest commit: c8ce059

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

Command	Mean [s]	Min [s]	Max [s]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	1.404 ± 0.016	1.383	1.435	1.00
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	1.405 ± 0.032	1.353	1.457	1.00 ± 0.03

[tatomyr]

It wasn't needed at all.

[tatomyr]

Exporting it explicitly in the index file: https://github.com/Redocly/redocly-cli/pull/2308/files#diff-9a4ceebe7c6f86856371906c3f061d3b56b7457022b05179884a113e7ced67e8R42

[tatomyr]

Mostly moving exports around. No real changes here.