Add new models

[sallyjunjun]

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Motivation

Support more models in InternEvo.

Modification

• add qwen2
  the attention implementation of qwen2 is sliding-window-attention, we add SWA class for this model. This is a new feature of flash-attn, with version after v2.3.0.
• add baichuan2
  the attention implementation of baichuan2 is MHA, with enable_qkv_fusion is True.
• add gemma
  support gelu, support add_unit_offset in layer_norm computation, support user defined head_dim in GQA
• add load and save ckpt in qwen2 model
• add load and save ckpt in baichuan2 model
• add load and save ckpt in gemma model

accuracy test result is as follows:
qwen2:
isp vs dp:

isp load internevo saved ckpt:

isp load hf ckpt:

baichuan2:
isp vs dp:

isp load internevo saved ckpt:

isp load hf ckpt:

gemma:
isp vs dp:

isp load internevo saved ckpt:

isp load hf ckpt:

BC-breaking (Optional)

Does the modification introduce changes that break the backward compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here and update the documentation.

Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects.
• CLA has been signed and all committers have signed the CLA in this PR.

[sunpengsdu]

@huangting4201 看看这么改合理吗