Modify some errors and add new instructions

[gong-bit]

• Added float type registers in reg_map

• Fixed the error of slri instruction and added new instruction

• Improved in instr_arr.py, added the processing of float type related instructions, added class _R4 to handle R instruction type instructions with four register parameters, such as: "fmadd.s", "fnmadd.s"

• Improved the immediate analysis bit number of 20 bits for U shape instructions, parameter analysis order, and the immediate number order of S instructions;

"fadd.s", "fadd.d", "fmv.x.d", "fmv.w.x", 'fmv.x.w',

"fsub.s", "fmul.s", "fsub.s", "fmul.s", "fdiv.s", "feq.s", "feq.d", "fsqrt.s", "fmin.s", "fmax.s", "fle.s", "fle.d", "flt.s", "flt.d",

"fmadd.s","fnmadd.s","fmsub.s","fnmsub.s",

"fsub.d","fmul.d","fsub.d","fmul.d","fdiv.d",

"fclass.s",

"fcvt.s.wu","fcvt.s.w","fcvt.s.l","fcvt.s.lu",

"fcvt.d.wu","fcvt.d.w","fcvt.d.l","fcvt.d.lu",

"fcvt.w.s","fcvt.wu.s","fcvt.l.s","fcvt.lu.s",

"fsgnj.s","fsgnjn.s","fsgnjx.s"

• Add the test file test9.s to test the newly added instructions. The specific content format is: instruction + correct answer. Since I don't know much about the specific test process of test_class.py, I didn't register it in test_class.py. You still need to complete the test content.