Add Static Credentials method to Python SDK (#12094)

Author: Pseudolukian

ydb/docs/en/core/reference/ydb-sdk/_includes/auth.md

@@ -25,6 +25,7 @@ You can click any of the methods below to go to the source code of an example in
   | Access Token | [ydb.AccessTokenCredentials(token)](https://github.com/yandex-cloud/ydb-python-sdk/tree/master/examples/access-token-credentials) |
   | Metadata | [ydb.iam.MetadataUrlCredentials()](https://github.com/yandex-cloud/ydb-python-sdk/tree/master/examples/metadata-credentials) |
   | Service Account Key | [ydb.iam.ServiceAccountCredentials.from_file(<br/>key_file, iam_endpoint=None, iam_channel_credentials=None)](https://github.com/yandex-cloud/ydb-python-sdk/tree/master/examples/service-account-credentials) |
+  Static Credentials | [ydb.StaticCredentials.from_user_password(user, password)](https://github.com/ydb-platform/ydb-python-sdk/blob/main/examples/static-credentials/example.py) |
   | OAuth 2.0 token exchange | [ydb.oauth2_token_exchange.Oauth2TokenExchangeCredentials()](https://github.com/ydb-platform/ydb-python-sdk/blob/main/ydb/oauth2_token_exchange/token_exchange.py),<br/>[ydb.oauth2_token_exchange.Oauth2TokenExchangeCredentials.from_file(cfg_file, iam_endpoint=None)](https://github.com/ydb-platform/ydb-python-sdk/blob/main/ydb/oauth2_token_exchange/token_exchange.py) |
   | Determined by environment variables | `ydb.credentials_from_env_variables()` |
 

ydb/docs/ru/core/reference/ydb-sdk/_includes/auth.md

@@ -25,6 +25,7 @@
   Access Token | [ydb.AccessTokenCredentials(token)](https://github.com/yandex-cloud/ydb-python-sdk/tree/master/examples/access-token-credentials) |
   Metadata | [ydb.iam.MetadataUrlCredentials()](https://github.com/yandex-cloud/ydb-python-sdk/tree/master/examples/metadata-credentials)
   Service Account Key | [ydb.iam.ServiceAccountCredentials.from_file(<br/>key_file, iam_endpoint=None, iam_channel_credentials=None)](https://github.com/yandex-cloud/ydb-python-sdk/tree/master/examples/service-account-credentials) |
+  Static Credentials | [ydb.StaticCredentials.from_user_password(user, password)](https://github.com/ydb-platform/ydb-python-sdk/blob/main/examples/static-credentials/example.py) |
   OAuth 2.0 token exchange | [ydb.oauth2_token_exchange.Oauth2TokenExchangeCredentials()](https://github.com/ydb-platform/ydb-python-sdk/blob/main/ydb/oauth2_token_exchange/token_exchange.py),<br/>[ydb.oauth2_token_exchange.Oauth2TokenExchangeCredentials.from_file(cfg_file, iam_endpoint=None)](https://github.com/ydb-platform/ydb-python-sdk/blob/main/ydb/oauth2_token_exchange/token_exchange.py) |
   Определяется по переменным окружения | `ydb.credentials_from_env_variables()` |