feat(pt/dp/jax/xp): add DPA3 descriptor (#4609)

**NOTE**: examples, custom ops and docs will be updated in other PRs.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
- Introduced the `DescrptDPA3` descriptor for advanced molecular
simulations, enhancing flexibility and performance.
- Added support for the SiLU activation function, expanding options for
neural network configurations.
- Integrated refined repflow modules to improve message passing and
descriptor computations.
  - Added a new model configuration `model_dpa3` for testing purposes.

- **Tests**
- Expanded test coverage to include the new `DescrptDPA3` descriptor and
repflow functionalities, ensuring consistency and reliability across
different backends.
- Implemented comprehensive unit tests for `DescrptDPA3` to validate its
functionality and performance across various configurations.
- Added parameterized tests for `DescrptDPA3` to assess its behavior
under different conditions.
- Introduced a new test class `TestMultiTaskDPA3` for multitask training
scenarios involving `model_dpa3`.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: iProzd

deepmd/common.py

@@ -53,6 +53,7 @@
     "tanh",
     "gelu",
     "gelu_tf",
+    "silu",
     "none",
     "linear",
 ]

deepmd/dpmodel/descriptor/__init__.py

@@ -5,6 +5,9 @@
 from .dpa2 import (
     DescrptDPA2,
 )
+from .dpa3 import (
+    DescrptDPA3,
+)
 from .hybrid import (
     DescrptHybrid,
 )
@@ -30,6 +33,7 @@
 __all__ = [
     "DescrptDPA1",
     "DescrptDPA2",
+    "DescrptDPA3",
     "DescrptHybrid",
     "DescrptSeA",
     "DescrptSeAttenV2",