[llvm] [readtapi] Use OptParser.td for options (PR #72183)

[Cyndy Ishida via llvm-commits]

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cyndyishida wrote:

Yes, I was mostly following a pattern set by other tools. But it's not super consistent anyway. 

```
/Projects/llvm/llvm-project/llvm/tools
$ fd Opts.td
llvm-cvtres/Opts.td
llvm-cxxfilt/Opts.td
llvm-debuginfod/Opts.td
llvm-dwp/Opts.td
llvm-gsymutil/Opts.td
llvm-ifs/Opts.td
llvm-libtool-darwin/Opts.td
llvm-lipo/LipoOpts.td
llvm-ml/Opts.td
llvm-mt/Opts.td
llvm-nm/Opts.td
llvm-objcopy/BitcodeStripOpts.td
llvm-objcopy/CommonOpts.td
llvm-objcopy/InstallNameToolOpts.td
llvm-objcopy/ObjcopyOpts.td
llvm-objcopy/StripOpts.td
llvm-objdump/ObjdumpOpts.td
llvm-objdump/OtoolOpts.td
llvm-rc/Opts.td
llvm-rc/WindresOpts.td
llvm-readobj/Opts.td
llvm-readtapi/Opts.td
llvm-size/Opts.td
llvm-strings/Opts.td
llvm-symbolizer/Opts.td
llvm-tli-checker/Opts.td
sancov/Opts.td
```

https://github.com/llvm/llvm-project/pull/72183