From: @yanzhenxiang2020
Reviewed-by: 
Signed-off-by:

From: @wanyiming
Reviewed-by: 
Signed-off-by:

From: @peilin-wang
Reviewed-by: @liangchenghui,@wuxuejian
Signed-off-by: @liangchenghui

From: @wangyanling10
Reviewed-by: 
Signed-off-by:

fix ci

fix ci

fix ci

fix ci

From: @xcnick
Reviewed-by: 
Signed-off-by:

From: @zh_qh
Reviewed-by: @hwhewei,@zhunaipan
Signed-off-by: @zhunaipan

From: @peilin-wang
Reviewed-by: 
Signed-off-by:

From: @david-he91
Reviewed-by: @liangchenghui,@guoqi1024
Signed-off-by: @liangchenghui

fix ci

---
Remove the routine of handling isolated nodes in Renormalize.
Add isolated nodes from Parser&Resolver.
Modify isolated nodes handling in FG&Manager.
Optimize the renormalize routines.
Other optimizations.

add tests

removed some unused imports

fix ci

From: @yang_chun
Reviewed-by: @wuxuejian,@c_34
Signed-off-by: @wuxuejian

From: @wanyiming
Reviewed-by: 
Signed-off-by:

From: @TFbunny
Reviewed-by: @tom__chen
Signed-off-by:

From: @wangrao124
Reviewed-by: 
Signed-off-by:

From: @ginfung
Reviewed-by: 
Signed-off-by:

From: @peilin-wang
Reviewed-by: 
Signed-off-by:

From: @TFbunny
Reviewed-by: @tom__chen,@robingrosman
Signed-off-by: @robingrosman

From: @TFbunny
Reviewed-by: @robingrosman
Signed-off-by: @robingrosman

fix ci

fix ci

From: @TFbunny
Reviewed-by: @robingrosman,@tom__chen
Signed-off-by: @robingrosman

From: @wangrao124
Reviewed-by: @wuxuejian,@kisnwang
Signed-off-by: @wuxuejian

From: @tom__chen
Reviewed-by: @liangchenghui,@robingrosman
Signed-off-by: @liangchenghui

From: @peilin-wang
Reviewed-by: @robingrosman,@tom__chen
Signed-off-by: @robingrosman

From: @peilin-wang
Reviewed-by: @robingrosman,@tom__chen
Signed-off-by: @robingrosman

From: @zengzitao
Reviewed-by: 
Signed-off-by:

From: @peilin-wang
Reviewed-by: @robingrosman,@tom__chen
Signed-off-by: @robingrosman

change to test in graph mode

From: @peilin-wang
Reviewed-by: @robingrosman,@tom__chen
Signed-off-by: @robingrosman