Implement Version class for third-party dependency version checking.

[Spartee]

Description

In (#122) the _install classes were introduced including the Versioner class which holds the versions for many third-party dependencies in SmartSim, including SmartRedis.

Currently each version is held as a string i.e. "1.2.3", but this is inflexible and can break (see #121). We need operators (> , <, >=) that can handle special versions of these dependencies (i.e 1.2.3.post).

Justification

Provide build classes with better methods to check versions and hence increase the stability of the build.

Implementation Strategy

• see This for how PyTorch has flexible version classes.
• Use above and pkg_resources.packging.version.Version to convert listed versions in buildenv.py/Versioner to a SSVersion class similar to torch.
• Use this class for all listed versions.
  - So RedisAI version would look like

class Versioner:
    """Buildtime configuration of third-party dependencies"""

    # ....

    # RedisAI
    REDISAI = Version(os.environ.get("SMARTSIM_REDISAI", "1.2.3"))

• enforce version constraints) in the pip build setup.py (redis > 6.0)
• enforce ML backend constraints based on RedisAI version in CLI build
• enforce tf and torch runtime contraints in smartsim/tf/__init__.py
• Check version of user provided redis/redis-cli in config.py and enforce contraints (redis > 6.0)
• Some tests for the version class itself.