feat: oauth return location header

[loks0n]

We want to allow server-side SDKs to use webAuth type endpoints such as createOAuth2Session and createOAuth2Token.

These endpoints should return the string value of the location header on server SDKs.

for example:

const redirectUrl = await account.createOAuth2Token("github", successUrl, failureUrl);`

console.log(redirectUrl) // outputs: https://github.com/oauth2?query=asdkfjhasdkjfhasdhkf?....

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