Explain macro to handle metadata for descibing the vdbe instructions.

This includes p1, p2 and p3 mapped from a match table based on attribute
tags added to the enum variant fields.

A description attribute that is pulled from the enum variant and builds out
a const array for the .opcodes command that is generated from the descriptions.

cli/app.rs

@@ -1,4 +1,3 @@
-use crate::opcodes_dictionary::OPCODE_DESCRIPTIONS;
 use cli_table::{Cell, Table};
 use limbo_core::{Database, LimboError, RowResult, Value};
 
@@ -434,13 +433,13 @@ impl Limbo {
                 }
                 Command::Opcodes => {
                     if args.len() > 1 {
-                        for op in &OPCODE_DESCRIPTIONS {
+                        for op in &limbo_core::INSN_DESCRIPTIONS {
                             if op.name.eq_ignore_ascii_case(args.get(1).unwrap().trim()) {
                                 let _ = self.write_fmt(format_args!("{}", op));
                             }
                         }
                     } else {
-                        for op in &OPCODE_DESCRIPTIONS {
+                        for op in &limbo_core::INSN_DESCRIPTIONS {
                             let _ = self.write_fmt(format_args!("{}\n", op));
                         }
                     }

core/Cargo.toml

@@ -53,7 +53,7 @@ pest = { version = "2.0", optional = true }
 pest_derive = { version = "2.0", optional = true }
 rand = "0.8.5"
 bumpalo = { version = "3.16.0", features = ["collections", "boxed"] }
-macros = { path = "../macros" }
+limbo_macros = { path = "../macros" }
 
 [target.'cfg(not(target_family = "windows"))'.dev-dependencies]
 pprof = { version = "0.14.0", features = ["criterion", "flamegraph"] }

core/lib.rs

@@ -52,6 +52,9 @@ pub use storage::wal::CheckpointStatus;
 pub use storage::wal::Wal;
 pub use types::Value;
 
+pub use vdbe::InsnDescription;
+pub use vdbe::INSN_DESCRIPTIONS;
+
 pub static DATABASE_VERSION: OnceLock<String> = OnceLock::new();
 
 #[derive(Clone)]