feat: Get ID from headers

[simenandre]

As there are a few methods in the Fiken API where the body is empty, and users need to get the ID of a created resource.

Some of the methods in Fiken API you can create a resource, but it doesn't respond with any data. The same methods often/always sends a location header (e.g. location: https://api.fiken.no/api/v2/companies/fiken-demo-historisk-fasong-as1/bankAccounts/1933231237). This pull requests adds a function to retrieve the ID of that location header.

Example:

const res = await fiken.createBankAccountRaw({
  companySlug,
  bankAccountRequest,
});

const id = getIDFromHeaders(res.raw);
// example: id = 1933231237

[github-actions]

🎉 This PR is included in version 1.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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