Disassembler for inspecting compiled Risor code

[myzie]

Adds a disassembler package and Risor CLI command to inspect compiled Risor code.

For example:

risor dis -c "1 + 2"
+--------+------------+----------+------+
| OFFSET |   OPCODE   | OPERANDS | INFO |
+--------+------------+----------+------+
|      0 | LOAD_CONST |        0 | 1    |
|      2 | LOAD_CONST |        1 | 2    |
|      4 | BINARY_OP  |        1 | +    |
+--------+------------+----------+------+

Other supporting changes:

• Minor reorganization of cmd/risor package to clean things up
• Make opcode integers fixed rather than using iota
• make tidy

[codecov]

Codecov Report

Attention: Patch coverage is 29.83294% with 294 lines in your changes are missing coverage. Please review.

Project coverage is 31.44%. Comparing base (a897b5c) to head (29f05fc).

Files	Patch %	Lines
cmd/risor/util.go	0.86%	112 Missing and 2 partials ⚠️
dis/dis.go	55.85%	45 Missing and 4 partials ⚠️
op/op.go	9.80%	46 Missing ⚠️
cmd/risor/options.go	50.87%	18 Missing and 10 partials ⚠️
cmd/risor/root.go	18.51%	22 Missing ⚠️
cmd/risor/dis.go	41.66%	16 Missing and 5 partials ⚠️
cmd/risor/version.go	38.09%	13 Missing ⚠️
cmd/risor/main.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
- Coverage   31.52%   31.44%   -0.09%     
==========================================
  Files         113      121       +8     
  Lines       14461    15103     +642     
==========================================
+ Hits         4559     4749     +190     
- Misses       9331     9763     +432     
- Partials      571      591      +20     

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