Update examples for Auth Next.

[dmkozh]

What

• Introduced 3 new examples
• Removed redundant examples
• Updated most of the examples that needed authorization to use Auth Next

Why

Support the latest SDK version

Known limitations

There are still 2-3 more complex examples that need to be updated (token, liquidity pool and maybe lp router, though it probably can be removed)

[gitpod-io[bot]]