SNOW-1006312: Cancel context not propagated to snowflakeFileTransferAgent on PUT/GET command

[sfc-gh-ext-simba-jl]

Description

issue 822: https://github.com/snowflakedb/snowflake-sdks-drivers-issues-teamwork/issues/822 Context not propagated to snowflakeFileTransferAgent on PUT/GET command; cancellation is not supported

This PR fixes the issue by adding ctx to snowflakeFileTransferAgent and adding a channel to detect if the file transfer process has been cancelled during processFileTransfer.

Checklist

• [x] Created tests which fail without the change (if possible)
• [ ] Extended the README / documentation, if necessary

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 85.71429% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.46%. Comparing base (aa4b7cd) to head (f7c393f). Report is 1 commits behind head on master.

Files	Patch %	Lines
connection.go	84.61%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1108 +/- ## ========================================== - Coverage 82.48% 82.46% -0.03% ========================================== Files 54 54 Lines 12832 12916 +84 ========================================== + Hits 10585 10651 +66 - Misses 2247 2265 +18 ```

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