Snowddl

- Added `is_memoizable` for `FUNCTION` object type.
- Added tests for `FUNCTION` object type.
- Starting slash `/` in `STAGE FILE` path is now optional.
- Runtime version for `FUNCTION` and `PROCEDURE` in YAML config can now be defined either as `number` or as `string`. Previously it was only defined as string, which caused confusion for numeric versions, like Python "3.8".

- Added `__hash__` implementation for `Ident` objects. It allows usage of such objects as keys for dictionaries.

- Implemented `ALERT` object type.
- Added better error message for missing `text` in YAML config for `VIEW` object type.

- Completely reworked `STAGE` object type resolver. Now it checks actual property values and does not rely on short hash anymore. `STAGE` objects will be re-created only when absolutely necessary. ALTER will be applied for the majority of changes.
- Introduced CLI option `--refresh-stage-encryption` to re-apply encryption parameters for each external `STAGE`. Normally it is not possible to compare config encryption parameters with existing parameters in Snowflake.
- Introduced a few "safe" alters for `TABLE` object type: (1) add new column, (2) change comment on table, (3) change comment on specific column. Previously all alters for `TABLE` were unsafe.
- `ROLE` resolver will no longer try to revoke `OWNERSHIP` grant on objects. This grant can only be transferred.
- `ROLE` resolver will now revoke `WRITE` permission on `STAGES` before trying to revoke `READ` permission.

- Fixed incorrect condition checking `comment` property for `WAREHOUSE` object type, which caused every warehouse to be re-created on every run.
- `FILE_FORMAT` object type is now properly replaced when `type` was changed. Other changes are still applied using `alter file format` command.
- Added tests for `PROCEDURE` and `FILE_FORMAT` object types.

- Fixed incorrect order of parameters when resolving `PROCEDURE` with both `comment` and `is_execute_as_caller`.
- Added protection from `FUNCTION` and `PROCEDURE` arguments with TIMESTAMP-like type and non-default precision. Snowflake bug, case 00444370.

Tests for UDFs and procedures are expected to be added in the next version.