[lldb] Improved formatting of 'register read' command. (#188049)
Made alignment of 'register read' command's output to be dynamic to the
register's name lengths -> `=` signs of different registers align when
printed as sets, also aligned when picked in some custom ordering. No
alignment between separate sets is included (i.e, each set is aligned to
itself only). Sample change:
```
Micro-architectural Registers:
r_pc = 0x0000108c main.xexe`main + 20 at main.c:5:5
instr_trace_r_init_print = 0x00
wb_csr_file_r_mstatus = 0x00000000
wb_csr_file_r_mie = 0x00000000
```
This example is changed into:
```
Micro-architectural Registers:
r_pc = 0x0000108c main.xexe`main + 20 at main.c:5:5
instr_trace_r_init_print = 0x00
wb_csr_file_r_mstatus = 0x00000000
wb_csr_file_r_mie = 0x00000000
```
---------
Co-authored-by: Aleksandr Levin <alexander.levin03@mail.ru>
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