api!: remove provider-db handling and provider lookup APIs

BREAKING CHANGE: provider lookup APIs were removed from CFFI and JSON-RPC.

also removes offline provider database code and generated provider data,
provider-specific fields in configure/transport paths, and REPL providerinfo.

python/src/deltachat/provider.py

@@ -1,46 +0,0 @@
-"""Provider info class."""
-
-from .capi import ffi, lib
-from .cutil import as_dc_charpointer, from_dc_charpointer
-
-
-class ProviderNotFoundError(Exception):
-    """The provider information was not found."""
-
-
-class Provider:
-    """
-    Provider information.
-
-    :param domain: The email to get the provider info for.
-    """
-
-    def __init__(self, account, addr) -> None:
-        provider = ffi.gc(
-            lib.dc_provider_new_from_email(account._dc_context, as_dc_charpointer(addr)),
-            lib.dc_provider_unref,
-        )
-        if provider == ffi.NULL:
-            raise ProviderNotFoundError("Provider not found")
-        self._provider = provider
-
-    @property
-    def overview_page(self) -> str:
-        """URL to the overview page of the provider on providers.delta.chat."""
-        return from_dc_charpointer(lib.dc_provider_get_overview_page(self._provider))
-
-    @property
-    def get_before_login_hints(self) -> str:
-        """Should be shown to the user on login."""
-        return from_dc_charpointer(lib.dc_provider_get_before_login_hint(self._provider))
-
-    @property
-    def status(self) -> int:
-        """The status of the provider information.
-
-        This is one of the
-        :attr:`deltachat.const.DC_PROVIDER_STATUS_OK`,
-        :attr:`deltachat.const.DC_PROVIDER_STATUS_PREPARATION` or
-        :attr:`deltachat.const.DC_PROVIDER_STATUS_BROKEN` constants.
-        """
-        return lib.dc_provider_get_status(self._provider)