[pakcage/plugin-multi-tenant] Please allow create tenant cookie's name

[soranoo]

Just like we can specify the payload cookie's name, it would be nice if we could do the same for the tenant cookie.

Now the cookie name is hard-coded in

payload/packages/plugin-multi-tenant/src/utilities/getTenantFromCookie.ts

Line 16 in 11a4a20

const selectedTenant = cookies.get('payload-tenant') || null

Ofc we can just create our own function, but having a built-in solution would still be nice.

PS: I am happy to contribute if the team agree with this feature request