Add `shadowNearPlaneOffset` property in `DirectLight`

Walkthrough

The changes introduce a new public property shadowNearPlaneOffset to the DirectLight class, replacing the deprecated shadowNearPlane in the Light class. Several private getter methods for shadow projection matrices have been removed across multiple light classes, indicating a shift in shadow handling. Additionally, the CascadedShadowCasterPass class has been updated to utilize the new shadowNearPlaneOffset parameter. Import statements have been adjusted to remove unused dependencies, streamlining the codebase.

Changes

File Path	Change Summary
`packages/core/src/lighting/DirectLight.ts`	Added property `shadowNearPlaneOffset`; removed method `_shadowProjectionMatrix`.
`packages/core/src/lighting/Light.ts`	Marked `shadowNearPlane` as deprecated; removed abstract getter `_shadowProjectionMatrix`.
`packages/core/src/lighting/PointLight.ts`	Removed private getter `_shadowProjectionMatrix`.
`packages/core/src/lighting/SpotLight.ts`	Removed private getter `_shadowProjectionMatrix`.
`packages/core/src/shadow/CascadedShadowCasterPass.ts`	Updated parameter from `light.shadowNearPlane` to `light.shadowNearPlaneOffset`.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant DirectLight
    participant Light
    participant CascadedShadowCasterPass

    User->>DirectLight: Create instance
    DirectLight->>DirectLight: Initialize shadowNearPlaneOffset
    User->>Light: Access shadow properties
    Light->>Light: Return deprecated shadowNearPlane
    User->>CascadedShadowCasterPass: Call shadow casting function
    CascadedShadowCasterPass->>DirectLight: Use shadowNearPlaneOffset

Poem

🐇 In the meadow, shadows play,
A new offset leads the way.
Light shines bright, artifacts flee,
Hopping forward, wild and free!
With each change, we dance and cheer,
A brighter world is drawing near! 🌟

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galacean / engine