[SNOW-1050418] OktaAuthenticator refactor part1

[SzymonSmykala]

Description

Cleaned up OktaAuthenticator, and prepared for refactoring for object-oriented code.

Checklist

• Code compiles correctly
• Code is formatted according to Coding Conventions
• Created tests which fail without the change (if possible)
• All tests passing (dotnet test)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[SzymonSmykala]

I have read the CLA Document and I hereby sign the CLA

[SzymonSmykala]

Coding conventions under link: https://github.com/snowflakedb/snowflake-connector-net/CodingConventions.md not found

[sfc-gh-knozderko]

Hi @SzymonSmykala could you please provide some context of your changes?
Is it just a refactor or you would like to introduce some new functionality? Do you have any business need related to this changes? It's called "part 1" so I suppose you would like to add/refactor more. Could you for example create a Github issue with the high level description what you would like to achieve and link your PR with it? Knowing the broader context would help us a lot. Thanks.

[SzymonSmykala]

Hi @SzymonSmykala could you please provide some context of your changes? Is it just a refactor or you would like to introduce some new functionality? Do you have any business need related to this changes? It's called "part 1" so I suppose you would like to add/refactor more. Could you for example create a Github issue with the high level description what you would like to achieve and link your PR with it? Knowing the broader context would help us a lot. Thanks.

That's in progress, let me create a GitHub issue.

[SzymonSmykala]

@sfc-gh-knozderko Here it is : #864