API: fix: inject header prior to AuthManager

[rinzool]

Closes #2655

Rationale for this change

Headers should be injected before creating auth manager in order for Polaris catalog to work.

Are these changes tested?

Yes, with following code:

from pyiceberg.catalog import load_catalog
param = {
    "type": "rest",
    "uri": "http://localhost:8181/api/catalog",
    "warehouse": "s3://...",
    "s3.access-key-id": "***",
    "s3.secret-access-key": "***",
    "s3.path-style-access": True,
    "header.X-Iceberg-Access-Delegation": "",
    "scope": "PRINCIPAL_ROLE:ALL",
    "credential": "***:***",
}

catalog = load_catalog("default", **param)

print(catalog.list_namespaces())

• With version 0.10.0 I have: pyiceberg.exceptions.RESTError: MissingOrInvalidRealm
• With this development (using poetry run ...) I can connect to the catalog

Are there any user-facing changes?

No

[Fokko]

Great catch @rinzool 🙌

[rinzool]

Great catch @rinzool 🙌

Thanks @Fokko!

Do you know where the next version of pyiceberg will be published on pypi?

[kevinjqliu]

Do you know where the next version of pyiceberg will be published on pypi?

you can follow #2574 for updates on the next version.

we also have https://test.pypi.org/project/pyiceberg/ for nightly builds