fix types default export

[shrpne]

Description

Some packages export their classes as default, but .d.ts definitions don't have default export. So i fixed it by adding export default to .d.ts files

This PR only fixes .d.ts and types tests, so it doesn't affect actual code and can't break anything

Fixes #5543

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist for 1.x:

• I have selected the correct base branch.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• Any dependent changes have been merged and published in downstream modules.
• I ran npm run dtslint with success and extended the tests and types if necessary.
• I ran npm run test:cov and my test cases cover all the lines and branches of the added code.
• I ran npm run build with success.
• I have tested the built dist/web3.min.js in a browser.
• I have tested my code on the live network.
• I have checked the Deploy Preview and it looks correct.
• I have updated the CHANGELOG.md file in the root folder.

[Muhammad-Altabba]

Thanks @shrpne for your contribution.
I merged your changes to a feature branch that I created. And then I will create an MR from my branch. This is because for security reasons the GitHub Actions would not be able to run for a community member.