Block creation by yaml

[tmiyamon]

First check

• [X] I added a descriptive title to this issue.
• [X] I used the GitHub search to find a similar request and didn't find it.
• [X] I searched the Prefect documentation for this feature.

Describe the current behavior

Currently, Prefect's UI and CLI do not offer functionality to create Blocks from YAML or configuration files. This limitation makes it challenging to manage information efficiently.

Describe the proposed behavior

Add functionality to create Blocks from configuration files in Prefect's UI or CLI.

Example Use

prefect blocks load config.yaml 

The contents of config.yaml

string/test-string:
  value: test-value
sqlalchemy-connector/db-uri:
  connection_info:
    driver: postgresql+asyncpg
    database: test-db
    username: user
    password: password
    host: localhost
    port: "5432"

Additional context

Consider adding an overwrite option when creating or updating Blocks. This feature would be useful during execution.

[aaazzam]

👋 Takuya! Thanks for contributing this.

• At the moment, Blocks are intentionally code-first and a way of persisting / hydrating Python classes (and importantly their methods) across environments.
• If you're looking for a way to create blocks from YAML, happy to share some code examples of how to do that.

Either way, I think I'm going to convert this to a discussion for now. We're always happy to revisit some of our design assumptions or publish some conveniences if there's enough community support!