[BEAM-9897] Add cross-language support to SnowflakeIO.Read

[purbanow]

This PR is part of adding SnowflakeIO to Java SDK BEAM-9893. Mainly this PR is adding support for cross-language read operation (BEAM-9897) and improvements for credentials mechanism.

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Post-Commit Tests Status (on master branch)

Lang	SDK	Dataflow	Flink	Samza	Spark	Twister2
Go		---		---		---
Java
Python				---		---
XLang	---	---		---	---		---

Pre-Commit Tests Status (on master branch)

---	Java	Python	Go	Website
Non-portable
Portable	---		---	---

See .test-infra/jenkins/README for trigger phrase, status and link of all Jenkins jobs.

[pjotrekk]

It would be good to add info to the website in this file in section Connector/transform support: beam/website/www/site/content/en/roadmap/connectors-multi-sdk.md