chore: delay _importDynamic initialization

[jacobator]

What/Why/How?

We use some of @redocly/openapi-core util functions in Reunite.
_importDynamic is an eval function that is initialized in the root of config-resolvers module which violates content security policies in Reunite.
This PR delays _importDynamic init to a later time - avoiding it's initialization in Reunite completely.

Reference

https://github.com/Redocly/redocly/issues/11257

Testing

Screenshots (optional)

Check yourself

• Code changed? - Tested with redoc/reference-docs/workflows (internal)
• All new/updated code is covered with tests
• New package installed? - Tested in different environments (browser/node)

Security

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

[changeset-bot]

⚠️ No Changeset found

Latest commit: 0e5a1bd

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[github-actions]

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
redocly lint packages/core/src/benchmark/benches/rebilly.yaml	976.7 ± 13.6	953.1	997.7	1.00 ± 0.02
redocly-next lint packages/core/src/benchmark/benches/rebilly.yaml	973.8 ± 15.3	951.5	998.3	1.00

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	78.56%	4993/6356
🟡	Branches	67.21%	2062/3068
🟡	Functions	72.98%	824/1129
🟡	Lines	78.85%	4711/5975

Test suite run success

809 tests passing in 121 suites.

Report generated by 🧪jest coverage report action from 0e5a1bd