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Add full extras and markers support for dependencies (#941)

## Summary

- Add `extra` parameter to `depends_on()` for defining project extras
groups (`extras_require` in setup.py)
- Add `markers` parameter to `depends_on()`, `build_depends_on()`, and
`plugin_depends_on()` for PEP 508 environment markers
- Generate `extras_require` in setup.py, emit markers in both pip
install targets and setup.py

### Usage

```python
# Extras groups (extras_require in setup.py)
project.depends_on("cryptography", ">=2.0", extra="security")
project.depends_on("pyOpenSSL", ">=0.14", extra="security")
project.depends_on("pytest", ">=6.0", extra="dev")

# Environment markers on any dependency type
project.depends_on("pywin32", ">=300", markers="sys_platform == 'win32'")
project.build_depends_on("wincertstore", markers="sys_platform == 'win32'")

# Combined
project.depends_on("pywin32", ">=300", extra="windows", markers="sys_platform == 'win32'")
```

## Test plan

- [x] 642 unit tests pass (was 636, +6 new)
- [x] 3 integration tests updated for `extras_require` in setup.py
output
- [x] Pre-existing integration test failures (`issue_862`,
`smoke_analyze`) tracked in #940

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