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

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

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

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

---
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.

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

From: @zhoufeng54
Reviewed-by: 
Signed-off-by:

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

From: @jojobugfree
Reviewed-by: @chujinjin,@jjfeing
Signed-off-by: @chujinjin

add tests

removed some unused imports

fix ci

Signed-off-by: zhoufeng <zhoufeng54@huawei.com>

From: @lizhenglong1992
Reviewed-by: @liucunwei,@heleiwang
Signed-off-by: @liucunwei

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

From: @lizhenglong1992
Reviewed-by: @heleiwang,@pandoublefeng
Signed-off-by: @pandoublefeng

From: @lizhenglong1992
Reviewed-by: 
Signed-off-by:

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

From: @shenwei41
Reviewed-by: 
Signed-off-by:

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

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

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

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

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

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

From: @lizhenglong1992
Reviewed-by: 
Signed-off-by:

From: @jojobugfree
Reviewed-by: @zhoufeng54,@chujinjin
Signed-off-by:

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