Connector Builder: Add support for multiple base URL'S

[btkcodedev]

Currently, a single base URL is supported by the connector builder, please make it support multiple base URL
CC: @lmossman
Ref Source with multiple bases:
Datadog Source: #44371

Error from the builder:

[brianbolt]

This would be a good feature. I am currently dealing with an api which had a search domain and a data domain. I want to be able to search and then call the data domain with the resulting ids as a substream but the low code solution doesn't work. I tried to "hack" the low code solution by trying https:// as the base url and then supply the full domain as the path but the way the low code solution tries to assemble the URLs does not allow for this.