fix: Allow configuring Faraday adapter with configure_connection block

[doryphores]

Fixes

A small change to Twilio::HTTP::Client to allow us to configure the Faraday adapter with configure_connection.

For example:

client = Twilio::REST::Client.new(account_sid, auth_token)

client.http_client.configure_connection do |faraday|
  faraday.adapter :typhoeus, verbose: true
end

Without this change, the above configuration would be ignored because the adapter is reset after the configure connection blocks are applied.

And we cannot pass params to the adapter with the adapter accessor on the client instance:

client = Twilio::REST::Client.new(account_sid, auth_token)

# here, we cannot configure the typhoeus adapter with verbose: true
client.http_client.adapter = :typhoeus

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

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