fix: commonJs default export

[curtis-h]

Description:

Our exported index.cjs was exporting a flattened object, but the Types show a default and commonJs targeted builds with TS would fail, expecting a default property which didn't exist.

Adds a default property to the export if one doesn't already exist.

Adding integration tests for TS builds to cjs and esm, and making all node integration tests use the same tests.

Checklist:

• My PR follows the contribution guidelines of this project
• My PR is free of third-party dependencies that don't comply with the Allowlist
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked the PR title to follow the conventional commit specification

[github-actions]

Lines	Statements	Branches	Functions
	76.14% (3636/4775)	66.53% (1666/2504)	80.29% (864/1076)

[coveralls]

Pull Request Test Coverage Report for Build 11840451295

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.06%) to 72.613%

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Totals
Change from base Build 11819333201:	0.06%
Covered Lines:	3528
Relevant Lines:	4649

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💛 - Coveralls