DEC Alpha disassembly and analysis plugins

[XVilka]

Your checklist for this pull request

• I've read the guidelines for contributing to this repository
• I made sure to follow the project's coding style
• I've documented or updated the documentation of every function and struct this PR changes. If not so I've explained why.
• I've added tests that prove my fix is effective or that my feature works (if possible)
• I've updated the rizin book with the relevant information (if needed)

Detailed description

Adds DEC Alpha architecture support

File for testing (from Debian Alpha port)
resolv.zip

rizin -A resolv
[0x120000710]> is
nth paddr      vaddr       bind   type size lib name
----------------------------------------------------------------------
8   0x00002060 0x120012060 GLOBAL OBJ  4        _IO_stdin_used
1   0x00000574 0x120000574 GLOBAL FUNC 16       imp.puts
2   0x00000578 0x120000578 GLOBAL FUNC 16       imp.__libc_start_main
3   0x0000057c 0x12000057c GLOBAL FUNC 16       imp.__printf_chk
4   0x00000580 0x120000580 GLOBAL FUNC 16       imp.gai_strerror
5   0x00000584 0x120000584 GLOBAL FUNC 16       imp.freeaddrinfo
6   0x00000588 0x120000588 GLOBAL FUNC 16       imp.inet_ntop
7   0x0000058c 0x12000058c GLOBAL FUNC 16       imp.getaddrinfo
[0x120000710]> afl
0x120000714    1 100          fcn.120000714
0x120000574    1 4            sym.imp.puts
0x120000578    1 4            sym.imp.__libc_start_main
0x12000057c    1 4            sym.imp.__printf_chk
0x120000580    1 4            sym.imp.gai_strerror
0x120000584    1 4            sym.imp.freeaddrinfo
0x120000588    1 4            sym.imp.inet_ntop
0x12000058c    1 4            sym.imp.getaddrinfo
0x120000712    1 2            fcn.120000712
0x120000870    1 16           entry.init0
0x120000800    1 44           entry.fini0
[0x120000710]> pdf @ fcn.120000714
╭ fcn.120000714();
│           0x120000714      0200bd27       ldah  $15,2($15)
│           0x120000718      fc98bd23       lda   $15,0x98fc($15)
│           0x12000071c      3e15c243       subq  $30,0x10,$30
│           0x120000720      0f14e047       bis   $31,0,$22
│           0x120000724      30801da6       ldq   $23,0x8030($15)
│           0x120000728      10003ea2       ldl   $24,0x10($30)
│           0x12000072c      18005e22       lda   $25,0x18($30)
│           0x120000730      18807da6       ldq   $28,0x8018($15)
│           0x120000734      00809da6       ldq   $27,0x8000($15)
│           0x120000738      1504e047       bis   $31,$0,$26
│           0x12000073c      0000deb7       stq   $30,0($30)
│           0x120000740      10807da7       ldq   $13,0x8010($15)
│           0x120000744      00405b6b       jsr   $26,($27),segment.GNU_STACK
│           0x120000748      00000000       COND_BRANCH imm:0, GPRC:$0, bb:0x120000750
│           0x12000074c      0000fe2f       ldq_u $31,0($30)
│           0x120000750      0200bb27       ldah  $15,2($13)
│           0x120000754      c098bd23       lda   $15,0x98c0($15)
│           0x120000758      f0ffde23       lda   $30,0xfff0($30)
│           0x12000075c      ffff1d26       ldah  $23,0xffff($15)
│           0x120000760      f07f1022       lda   $23,0x7ff0($23)
│           0x120000764      00005eb7       stq   $12,0($30)
│           0x120000768      ffff3d24       ldah  $1,0xffff($15)
│           0x12000076c      f07f2120       lda   $1,0x7ff0($1)
│           0x120000770      a1053040       cmpeq $1,$23,$1
╰       ╭─< 0x120000774      050020f4       bne   $1,0x12000078c

Test plan

CI is green

Closing issues

closes rizinorg/ideas#2