Update agent uri format

[hhcs9527]

TL;DR

1. Update agent uri format
2. update the read private key with .pem

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

How did you fix the bug, make the feature etc. Link to any design docs etc

Tracking Issue

Flyte Agent Ecosystem

[hhcs9527]

Hi @pingsutw,
I finished the code change to support multiple protocols and fixed the URI.
Please take a look, thanks.

[hhcs9527]

Hi @pingsutw,
I finished fixing the URI.

I will create the new PR to support the new URI.
new URI: uri="snowflake://dummy_user:dummy_account/dummy_warehouse/dummy_database/dummy_schema/dummy_table

Please take a look, thanks a lot!

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (a183186) 54.97% compared to head (e19fcd1) 55.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1861      +/-   ##
==========================================
+ Coverage   54.97%   55.00%   +0.02%     
==========================================
  Files         296      296              
  Lines       22231    22254      +23     
  Branches     2167     3350    +1183     
==========================================
+ Hits        12222    12241      +19     
+ Misses       9860     9850      -10     
- Partials      149      163      +14     

Files	Coverage Δ
...tekit-snowflake/flytekitplugins/snowflake/agent.py	89.87% <100.00%> (ø)
plugins/flytekit-snowflake/tests/test_agent.py	100.00% <ø> (ø)

... and 24 files with indirect coverage changes

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