SNOW-1881542 Upcoming Gosnowflake v2 changes

[sfc-gh-pfus]

We are planning a v2 release of the Go Snowflake Driver. The final scope is not fully decided, but the list of potential changes includes:

• Reduce module binary size, by making Arrow batches mode optional (either via compilation tag or by moving it to a separate module), estimated drop is ~36MB to ~20MB!
• Logger changes:
  • Drop Logrus dependency, make logger backend configurable (with default to slog)
  • Split logger to more configurable loggers (to set log levels more independently)
  • Make logger more configurable (i.e., configure time and line format)
• Remove obsolete or deprecated config options:
  • RaisePutGetError from SnowflakeFileTransferOptions (behaviour aligned to setting it to true)
  • ClientIP from Config struct (not used internally)
  • InsecureMode - replaced with DisableOCSPChecks
  • TelemetryDisabled - replaced with CLIENT_TELEMETRY_ENABLED session parameter
• Remove deprecated functions:
  • WithOriginalTimestamp - replaced with WithArrowBatchesTimestampOption
• Remove SnowflakeTransport/SnowflakeTransportTest - use Transporter field from Config or RegisterTLSConfig
• Move some global variables to reduced scope:
  • MaxChunkDownloadWorkers - to be configured per query basis
  • OCSP timeout/retry config - to Config/DSN
  • S3LoggingMode - to Config/DSN
• Fix typo in GOSNOWFLAKE_SKIP_REGISTERATION env variable
• WithMultistatement will not return error anymore, only context.Context
• Drop support for CustomJSONDecoderEnabled
• Context keys will have type migrated from string to internal structs
• Remove JSON stream downloader
• Combine WithMapValuesNullable and WithArrayValuesNullable into one
• Unify SNOWFLAKE_ and SF_ prefix of environment variables
• Arrow batches - conversion improvements.
• Array function may return error, not only the value.

We are targeting the release of V2 in spring 2026.