feat: Add data residency for eu and global regions

[shrutiburman]

Fixes DII-1230

This PR:

• Adds a setter setDataResidency() which allows the users to switch to EU sub region, reidrecting their requests to api.eu.sendgrid.com
• Upgrades the testing pipeline to node v10+ (eslint and typescript do not work well on <10 versions)
• Upgrades typescript, which was causing the pipleine failure for very long

Checklist

• [x] I acknowledge that all my contributions will be made under the project's license
• [x] I have made a material change to the repo (functionality, testing, spelling, grammar)
• [x] I have read the Contribution Guidelines and my PR follows them
• [x] I have titled the PR appropriately
• [x] I have updated my branch with the main branch
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have added the necessary documentation about the functionality in the appropriate .md file
• [x] I have added inline documentation to the code I modified

If you have questions, please file a support ticket.

[mvanzoest]

Hi, would it be possible to open a separate PR for the version upgrades? A number of people are awaiting #1387 in order to complete their security upgrades.

[shrutiburman]

I think we need to resolve this usability gap on the setApiKey and setDataResidency before we release.

We have resolved the discrepancy in the latest commits. The limitation no longer exists.