fix: return error with conflicting credential opts #705
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This commit ensures conflicting credential options result in a user-facing error.
This commit moves all the dialer config initialization into a single function in options.go. This will help the migration to supporting auth.Credentials and makes the relationship between all the options clear. Previously, there was a mix of option functions setting various fields, possibly returning errors, and the dialer initializer doing additional configuration work. This made it hard to understand how the different credential options related to one another and hid the bug of allowing callers to set conflicting options.
In addition, this commit adds end to end tests to verify the credential-related options work as intended. This is a belated port of GoogleCloudPlatform/cloud-sql-go-connector#460.
Related to #646