Added STREET model for FSNS dataset

street/testdata/charset_size=134.txt

+0	 
+133	<nul>
+1	l
+2	’
+3	é
+4	t
+5	e
+6	i
+7	n
+8	s
+9	x
+10	g
+11	u
+12	o
+13	1
+14	8
+15	7
+16	0
+17	-
+18	.
+19	p
+20	a
+21	r
+22	è
+23	d
+24	c
+25	V
+26	v
+27	b
+28	m
+29	)
+30	C
+31	z
+32	S
+33	y
+34	,
+35	k
+36	É
+37	A
+38	h
+39	E
+40	»
+41	D
+42	/
+43	H
+44	M
+45	(
+46	G
+47	P
+48	ç
+2	'
+49	R
+50	f
+51	"
+52	2
+53	j
+54	|
+55	N
+56	6
+57	°
+58	5
+59	T
+60	O
+61	U
+62	3
+63	%
+64	9
+65	q
+66	Z
+67	B
+68	K
+69	w
+70	W
+71	:
+72	4
+73	L
+74	F
+75	]
+76	ï
+2	‘
+77	I
+78	J
+79	ä
+80	î
+81	;
+82	à
+83	ê
+84	X
+85	ü
+86	Y
+87	ô
+88	=
+89	+
+90	\
+91	{
+92	}
+93	_
+94	Q
+95	œ
+96	ñ
+97	*
+98	!
+99	Ü
+51	“
+100	â
+101	Ç
+102	Œ
+103	û
+104	?
+105	$
+106	ë
+107	«
+108	€
+109	&
+110	<
+51	”
+111	æ
+112	#
+113	®
+114	Â
+115	È
+116	>
+117	[
+17	—
+118	Æ
+119	ù
+120	Î
+121	Ô
+122	ÿ
+123	À
+124	Ê
+125	@
+126	Ï
+127	©
+128	Ë
+129	Ù
+130	£
+131	Ÿ
+132	Û

street/testdata/charset_size_10.txt

+0	 
+9	<nul>
+1	a
+2	b
+3	r
+4	n
+4,5	m
+6	f
+7	.
+8	,

street/testdata/numbers.charset_size=12.txt

+0	 
+11	<nul>
+1	9
+2	8
+3	7
+4	6
+5	1
+6	4
+7	0
+8	3
+9	5
+10	2