Warpspeed

- Added GoogleSheetsReaderTool.
- Added GoogleSheetsWriterTool.
- Improved exception handling in steps.
- DataScientistTool now allows custom dependencies.
- Bug fixes, updated docs.

- Rename GalaxyBrain to Warpspeed.
- Add `ToolkitStep` to support multiple tools per step.
- Add abstract `Construct`, change `Workflows` to be DAGs, and add sequential `Pipelines`.
- Add `to_json` and `from_json` serialization for constructs and all underlying primitives.
- Flatten all Python namespaces.
- Remove rules validator.
- Add utils.Conversation
- Multiple bug fixes, improvements, and tests...

- Add ToolStep and ToolSubstep.
- Add tools: Calculator, DataScientist, Email, Wiki.
- Rename Completion to Prompt across Steps and Drivers.
- Templatize PromptStep inputs, inject Workflow context, and allow custom context.
- Add Tokenizer and token count methods to Workflows and StepArtifacts.
- Remove ComputeStep
- Bugfixes and tests.

- Added `BufferMemory` and `SummaryMemory`.
- Moved all memory implementations under a separate namespace.
- Added a standalone Jinja helper for rendering prompt templates `utils.J2`.
- Added `Workflow.to_prompt_string()` method to debug prompts more easily.
- Added `Memory.to_conversation_string()` method to view the whole conversation.
- Added `Workflow.add_steps()` to add multiple steps in one call.
- Bug fixes, new tests, and refactors...

- Add Prompt template customization
- Rename `conversation` rules namespace to `meta`
- Add `meta.speculate` rule
- Rename Driver to CompletionDriver
- Rename DriverSummarizer to CompletionDriverSummarizer
- Add Prompt tests

- Added ComputeStep for delegating computations to Python
- Consolidated summarization logic and added summarization step offset
- Consolidated Jinja prompt templates
- Added tests