Refactor syntax for accessing custom metadata

• Fixes connection creation and associated validations

• Adds further connectors (with icons)

• Adds SQL parser endpoint

• Add Lineage list API and integration tests

• Fix bug on locking custom metadata

• Refactor syntax for accessing custom metadata properties

  Previously the custom metadata property First Name would have been accessed as follows:
  cm.first_name

  This could cause confusion how the name was converted so now the following syntax will be used:

  cm['First Name']

Change name of terms property to assigned_term

• The name name of the property terms was changed to assigned_term this was to avoid a name collision with the terms property that existed on Glossaries
• Convenience properties were added to to support relationship_attributes

Add support for Badge Creation

• Added create method to Badge class to make it easier to create Badges
• Added Integration tests for CustomMetadata
• Updated the enum for AtlanConnectorType

Add support for Lineage

• Added the following classes to support lineage retrieval
  • LineageRelation
  • DirectedPair
  • LineageGraph
  • LineageResponse
• Added the get_lineage method to AtlanClient
• Modify create_typdef in client to handle creating EnumDef
• Refresh caches on any SDK-driven creates or deletes

Fix problem with custom metadata creation

Fix problem where custom metadata created via the SDK failed to show up in the UI

Fix problem with custom metadata creation

Fix problem where custom metadata created via the SDK failed to show up in the UI

Add create method to Process asset

Merge pull request #44 from atlanhq/create_lineage

Add create method to Process class

Improve attachment of terms to assets

• Add remove_terms method to AtlanClient
• Add append_terms method to AtlanClient
• Add replace_terms method to AtlanClient

Simplify Readme Creation

Modify create method of the Readme asset to ease attaching Readme to assets.

Fix README.md

Fix broken link in README.md