feat: support optional inject

Walkthrough

The pull request introduces enhancements to the Inject decorator and related classes, allowing for optional dependency injection. Key modifications include the addition of the InjectOptional function, updates to existing decorators to support optional parameters, and refinements in the handling of injected objects. The changes extend to various test cases and interfaces, ensuring comprehensive coverage of the new functionality. Overall, the updates improve the clarity and flexibility of dependency management within the framework.

Changes

File Path	Change Summary
`core/core-decorator/src/decorator/Inject.ts`	Modified the `Inject` decorator to handle parameters more consistently, added `InjectOptional` function for optional injections, and streamlined logic.
`core/core-decorator/test/decorators.test.ts`	Updated tests to include new optional injection objects and modified existing test cases to reflect optional dependencies.
`core/core-decorator/test/fixtures/decators/CacheService.ts`	Added optional service injections in `CacheService`, updated import paths, and modified existing injection configurations.
`core/core-decorator/test/fixtures/decators/ConstructorObject.ts`	Enhanced `ConstructorObject` to support optional constructor parameters using `Inject` and `InjectOptional`.
`core/metadata/src/impl/EggPrototypeBuilder.ts`	Updated `findInjectObjectPrototype` method to accept `InjectConstructor`, refactored `build` method for better error handling with optional injects.
`core/metadata/test/LoadUnit.test.ts`	Introduced a new test suite for optional injection, validating the creation of load units with optional dependencies.
`core/metadata/test/fixtures/modules/optional-inject-module/OptionalInjectService.ts`	Created new `OptionalInjectService` class with optional dependency properties.
`core/metadata/test/fixtures/modules/optional-inject-module/package.json`	Added `package.json` for the `optional-inject-service` module.
`core/types/core-decorator/Inject.ts`	Modified `InjectParams` interface to include an optional `optional` property.
`core/types/core-decorator/model/InjectObjectInfo.ts`	Added an optional `optional` property to `InjectObjectInfo` interface.
`core/types/metadata/model/EggPrototype.ts`	Introduced an optional `optional` property to several interfaces: `InjectObjectProto`, `InjectConstructorProto`, `InjectObject`, and `InjectConstructor`.
`core/types/core-decorator/model/InjectConstructorInfo.ts`	Added an optional `optional` property to `InjectConstructorInfo` interface.
`plugin/tegg/test/Inject.test.ts`	Introduced a new test suite for optional injection scenarios within the `tegg` plugin, validating functionality and error handling.
`plugin/tegg/test/fixtures/apps/invalid-inject/app/modules/module-a/BarService.ts`	Created `BarService` class with an injected property marked for dependency injection.
`plugin/tegg/test/fixtures/apps/optional-inject/app/modules/module-a/BarService.ts`	Defined `BarService` class with optional injected properties and a method to check their presence.
`plugin/tegg/test/fixtures/apps/optional-inject/app/modules/module-a/FooService.ts`	Defined `FooService` class with optional injected properties and a method to check their presence.
`standalone/standalone/test/fixtures/optional-inject/bar.ts`	Introduced `Bar` class with optional parameters for dependency injection.
`standalone/standalone/test/fixtures/optional-inject/foo.ts`	Introduced `Foo` class implementing `MainRunner` with optional injected properties.
`standalone/standalone/test/index.test.ts`	Added a new test suite for optional injection scenarios, verifying expected behaviors and error handling.

Possibly related PRs

#237: Enhances support for dependency injection within constructors, related to the modifications in the Inject decorator.
#239: Implements functionality for managing multiple instances in constructor injection, aligning with the main PR's focus on optional parameters.
#241: Addresses issues related to proper qualifiers for multi-instance injections, connecting to the main PR's modifications to the Inject decorator.
#247: Fixes issues with AOP in constructor injection types, relevant to the main PR's changes that improve the handling of constructor injections through the Inject decorator.

🐰 "In the garden where we play,
Optional injections come our way.
With Inject and InjectOptional too,
Flexibility blooms, oh what a view!
Hops of joy, we celebrate,
For dependencies now cooperate!" 🐇

📜 Recent review details

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📥 Commits

Files that changed from the base of the PR and between facba7e486354d6828090fdda0409f65695afb08 and e44fe71184626eb8c2214f8ea43d04cab0496900.

📒 Files selected for processing (1)

* standalone/standalone/test/index.test.ts (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (1)

* standalone/standalone/test/index.test.ts

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eggjs / tegg