feat: add optional host to Anthropic settings

[alexbfr]

I am using Anthropic's API over AWS bedrock, and to access a anthropic api -> bedrock proxy, I had to add the ability to change the API url. A nicer way would be to add another sub-setting like Custom OpenAI, but I didn't have enough time to do so. This PR simply adds another optional field Host to the Anthropic settings, which may be left empty. Feel free to dismiss this PR without any explanation.

Great extension, by the way! Kudos!

[carlrobertoh]

Thanks!

Can we remove the version bump? Otherwise it looks good.

[borgotta]

Hi! Didn't notice this PR exists and made a similar one: #948
The difference is that I hade to change x509trustmanager in default client because in my case I faced an issue where my company's host was protected by internal CA and default trustmanager doesn't load any additional CAs that may be present in your system.