Add table breaking down a household's net income by component for baseline and reform

[MaxGhenis]

e.g.:

Component	Baseline	Reform	Change	%
Net income	19000	21000	2000	10.5%
+ Gross income	20000	20000	0	0.0%
+ Taxes	-3000	-4000	-1000	33.3%
+ Benefits	2000	5000	3000	150.0%

which could expand to

Component	Baseline	Reform	Change	%
Net income	36000	37000	1000	2.8%
- Gross income	20000	20000	0	0.0%
Employment income	19500	19500	0	0.0%
Dividends	500	500	0	0.0%
- Taxes	-3000	-4000	-1000	33.3%
Income tax	-2300	-3900	-1600	69.6%
National Insurance	-650	0	650	-100.0%
Dividend tax	-50	-100	-50	100.0%
- Benefits	2000	5000	3000	150.0%
Universal Credit	2000	0	-2000	-100.0%
Universal Basic Income	0	5000	5000	-

[nikhilwoodruff]

It'd be really nice to have this generated procedurally from the entire computation tree, perhaps with a depth limit.

[MaxGhenis]

Duplicate of https://github.com/PolicyEngine/policyengine/issues/128