feat: add authentication_type method to authenticators

[padamstx]

This commit adds a new method ('authentication_type()') to the Authenticator base class, and each authenticator implementation (subclasses of Authenticator). The function will return a string indicating the authenticator type ('basic', 'iam', etc.). This brings the python core in line with the Go, Java and Node cores.

[codecov[bot]]

Codecov Report

Merging #127 (c45f65a) into main (52ab020) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #127      +/-   ##
==========================================
+ Coverage   99.50%   99.52%   +0.01%     
==========================================
  Files          22       22              
  Lines         815      835      +20     
==========================================
+ Hits          811      831      +20     
  Misses          4        4              

Impacted Files	Coverage Δ
ibm_cloud_sdk_core/authenticators/authenticator.py	88.23% <100.00%> (+13.23%)	:arrow_up:
...oud_sdk_core/authenticators/basic_authenticator.py	100.00% <100.00%> (ø)
..._core/authenticators/bearer_token_authenticator.py	100.00% <100.00%> (ø)
...sdk_core/authenticators/container_authenticator.py	100.00% <100.00%> (ø)
...loud_sdk_core/authenticators/cp4d_authenticator.py	100.00% <100.00%> (ø)
...cloud_sdk_core/authenticators/iam_authenticator.py	100.00% <100.00%> (ø)
...d_sdk_core/authenticators/no_auth_authenticator.py	100.00% <100.00%> (ø)
ibm_cloud_sdk_core/get_authenticator.py	100.00% <100.00%> (ø)

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[ibm-devx-sdk]

:tada: This PR is included in version 3.12.0 :tada:

The release is available on GitHub release

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