### What problem does this PR solve?
##### Summary
This PR fixes a bug in the metadata filtering logic where the contains
and not contains operators were behaving identically to the in and not
in operators. It also standardizes the syntax for string-based
operators.
##### The Issue
On the main branch, the contains operator was implemented as:
`matched = input in value if not isinstance(input, list) else all(i in
value for i in input)`
This logic is identical to the `in` operator. It checks if the metadata
(`input`) exists within the filter (`value`). For a "contains" search,
the logic should be reversed: _we want to check if the filter value
exists within the metadata input_.
##### Solution Presented Here
The operators have been rewritten using str.find():
Contains: `str(input).find(value) >= 0`
Not Contains: `str(input).find(value) == -1`
##### Advantage
This approach places the metadata (input) on the left side of the
expression. This maintains stylistic consistency with the existing start
with and end with operators in the same file, which also place the input
on the left (e.g., str(input).lower().startswith(...)).
##### Considered Alternative
In a previous PR we considered using the standard Python `in` operator:
`value in str(input)`.
The `in` operator is approximately 15% faster because it uses optimized
Python bytecode (CONTAINS_OP) and avoids an attribute lookup. However
following rejection of this PR we now propose the change presented here.
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [ ] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):
---------
Co-authored-by: Philipp Heyken Soares <philipp.heyken-soares@am.ai>
### What problem does this PR solve?
Add get_uuid, download_img and hash_str2int into misc_utils.py
### Type of change
- [x] Refactoring
---------
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
### What problem does this PR solve?
- Add time utilities and unit tests
### Type of change
- [x] Refactoring
---------
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
### What problem does this PR solve?
- rename rmSpace to remove_redundant_spaces
- move clean_markdown_block to common module
- add unit tests for remove_redundant_spaces and clean_markdown_block
### Type of change
- [x] Refactoring
---------
Signed-off-by: Jin Hai <haijin.chn@gmail.com>
