fix: Fix setApiKey and setTwilioEmailAuth to prevent overwriting baseUrl

[Be3751]

Fixes

If you use setDefaultRequest to change baseUrl to a custom value, and execute setDefaultRequest before setApiKey, the baseUrl that you thought you had changed to a custom value will be overwritten with SENDGRID_BASE_URL.

For example, if you want to send a request to a mock SendGrid prepared in a local environment, you need to be careful about the execution order of setApiKey and setDefaultRequest as follows.

// You must execute setApiKey first.
const client = new Client();
client.setApiKey('SG.xxxxx');
client.setDefaultRequest('baseUrl', 'localhost:3030');

In order to resolve it, I've decided to make the following changes, including setTwilioEmailAuth, which has a similar dependency:

• Do not execute setDefaultRequest('baseUrl', SENDGRID_BASE_URL) inside setApiKey since the default value for baseUrl is SENDGRID_BASE_URL .
• Execute setDefaultRequest('baseUrl', TWILIO_BASE_URL) inside setTwilioEmailAuth depending on whether baseUrl has been updated to a custom value.

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
• [ ] I have added the necessary documentation about the functionality in the appropriate .md file
• [ ] I have added inline documentation to the code I modified

If you have questions, please file a support ticket.