Make version consistent, send headers when using python sdk

[kdr]

Changes

• bumping project version
• Using importlib to set __version__ of module
• setting some custom headers to track SDK version, similar to JS sdk cloudglue/cloudglue-js@bd7e718

Example headers (pulled from backend logs)

[API]     headers: {
...
[API]       "x-sdk-client": "cloudglue-python",
[API]       "x-sdk-version": "0.1.3",
...
[API]     }