### This pull request adds the following:
- Missing mapping for the `yield` keyword.
- Outline scheme for `describe`, `it` and `test`
function_call_expressions (to support Pest runnable)
- Pest runnable support
- PHPUnit runnable support
- Task for running selected PHP code.
## Queries explanations
#### Query 1 (PHPUnit: Run specific method test):
1. Class is not abstract (because you cannot run tests from an abstract
class)
2. Class has `Test` suffix
3. Method has public modifier(or no modifiers, default is public)
4. Method has `test` prefix
#### Query 2 (PHPUnit: Run specific method test with `@test`
annotation):
1. Class is not abstract (because you cannot run tests from an abstract
class)
2. Class has `Test` suffix
3. Method has public modifier(or no modifiers, default is public)
4. Method has `@test` annotation
#### Query 3 (PHPUnit: Run specific method test with `#[Test]`
attribute):
1. Class is not abstract (because you cannot run tests from an abstract
class)
2. Class has `Test` suffix
3. Method has public modifier(or no modifiers, default is public)
4. Method has `#[Test]` attribute
#### Query 4 (PHPUnit: Run all tests inside the class):
1. Class is not abstract (because you cannot run tests from an abstract
class)
2. Class has `Test` suffix
#### Query 5 (Pest: Run function test)
1. Function expression has one of the following names: `describe`, `it`
or `test`
2. Function expression first argument is a string
### **PHPUnit: Example for valid test class**
<img width="549" alt="Screenshot 2024-05-08 at 10 41 34"
src="https://github.com/zed-industries/zed/assets/62463826/e84269de-4f53-410b-b93b-713f9448dc79">
### **PHPUnit: Example for invalid test class**
All the methods should be ignored because you cannot run tests on an
abstract class.
<img width="608" alt="Screenshot 2024-05-07 at 22 28 57"
src="https://github.com/zed-industries/zed/assets/62463826/8c6b3921-5266-4d88-ada5-5cd827bcf242">
### **Pest: Example**
https://github.com/zed-industries/zed/assets/62463826/bce133eb-0a6f-4ca2-9739-12d9169bb9d6
You should now see all your **Pest** tests inside the buffer symbols
modal.

Release Notes:
- Added test runnable detection for PHP (PHPUnit & Pest).
- Added task for running selected PHP code.
- Added `describe`, `test` and `it` functions to buffer symbols, to
support Pest runnable.
- Added `yield` keyword to PHP keyword mapping.