Feat/refactor process group

[mwiacx]

重构ProccessGroup的构建，之前的代码有点典型的为了面向对象而面向对象。

优化项：

• 复用共通的rank分配逻辑
• 易于理解的并行维度组合和拆分定义
• 易于改动并行组合的优先分配顺序
• 支持嵌套多层并行维度组合定义
• 支持并行组合中若干维度，比如中间维度匿名，只占位，不创建ProcessGroup
• 更统一的支持创建不完整的Group

单元测试：

• mtp: world_size = 16, zero1 = -1
• mtp: world_size = 16, tp = 4, zero1.5 = 2
• mtp: world_size = 16, tp = 2, pp = 2, zero1.5 = -1
• mtp moe: world_size = 16, tp = 2, pp = 2, ep = 4, ep_no_tp = false, zero1 = -1
• mtp moe: world_size = 16, tp = 2, pp = 1, ep = 2, ep_no_tp = true, zero1 = 2
• msp/fsp: world_size = 16, zero1 = -1
• msp/fsp: world_size = 16, tp = 4, zero1.5 = 2
• msp/fsp: world_size = 16, tp = 2, pp = 2, zero1.5 = -1
• msp/fsp moe: world_size = 16, tp = 2, pp = 2, ep = 4, ep_no_tp = false, zero1 = -1
• msp/fsp moe: world_size = 16, tp = 2, pp = 1, ep = 2, ep_no_tp = true, zero1 = 2
• isp: world_size = 16, zero = -1
• isp: world_size = 16, sp = 4, pp = 2, zero = -1
• isp: world_size = 16, wp = 4, pp = 1, zero1.5 = 2
• isp: world_size = 16, sp = 2, wp = 2, pp = 2, zero = -1
• isp moe: world_size = 16, sp = 2, wp =2, ewp = 4, ep = 2, pp = 2, zero = -1
• isp moe: world_size = 16, sp = 2, wp =2, ewp = 2, ep = 4, pp = 2, zero = -1
• isp 2d attn: world_size = 16, sp = 4, wp = 4, pp = 2, zero = -1, hp = 2, cp =2, window_size=1, head_first = True, interleaved = False
• isp 2d attn: world_size = 16, sp = 8, wp = 2, pp = 1, zero = -1, hp = 4, cp = 2, window_size=2, head_first = False, interleaved = False
• isp 2d attn: world_size = 16, sp = 8, wp = 2, pp = 1, zero = -1, hp = 1, cp = 8, window_size=4, head_first = False, interleaved = True
• isp 2d attn: world_size = 16, sp = 8, wp = 2, pp = 1, zero = -1, hp = 2, cp = 4, window_size=2, head_first = False, interleaved = True
• isp 2d attn moe : world_size = 16, sp = 4, wp = 4, pp = 2, ewp = 4, ep = 2, zero = -1, hp = 2, cp =2, window_size=2, head_first = True, interleaved = False
• isp 2d attn: world_size = 16, sp = 8, wp = 2, pp = 1, ewp = 2, ep = 4, zero = -1, hp = 2, cp = 4, window_size=2, head_first = False, interleaved = True