feat: Refactor and update tool loading to support modules

[Unshure]

Description

Refactor the tool loading logic as it was difficult to follow. I also added (or repaired) the functionality to load tools form the environment based on the tool string.

This makes the following code possible:

from strands import Agent
agent = Agent(tools=["strands_tools.file_read"])

I ended up deprecating a bunch of methods because they were so hard to understand what they were doing before. There was a lot of misdirection and poorly named function arguments.

Ive refactored it to what I think is easier to follow, while keeping the old methods for "backwards compatibility". Ive added deprecation methods to all of the things no longer in use so we can remove them in 2.0.

• Also added codecov reporting

Related Issues

N/A

Documentation PR

N/A

Type of Change

• Bug fix
• New feature

Testing

How have you tested the change? Verify that the changes do not break functionality or introduce warnings in consuming repositories: agents-docs, agents-tools, agents-cli

• I ran hatch run prepare

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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