[ Refactor ] Depreciated API Warnings

[mahimairaja]

Summary of the issue

Just showing the warning might not sufficient, atleast in python environment.

moorcheh-python-sdk/moorcheh_sdk/_legacy_client.py

Lines 64 to 69 in c8240a4

	warnings.warn(
	"create_namespace is deprecated and will be removed in a future version. "
	"Use client.namespaces.create instead.",
	DeprecationWarning,
	stacklevel=2,
	)

python interpreter ignore the warnings by default to end users, it may cause unintended frustrations to the team using deprecated methods.

Suggested solution:

Defining a custom warning would help avoiding the ignorance

import warnings

class MethodDeprecationWarning(UserWarning):
    pass

warnings.warn(
    "create_namespace() is deprecated",
    category=MethodDeprecationWarning,
    stacklevel=2
)