Replace the current source map implementation with the source maps produced from the compiler.

[JoshuaBatty]

forc-debug currently defines and works with the source map as below

pub type Line = i64;
pub type Instruction = u64;
pub type FileSourceMap = HashMap<Line, Vec<Instruction>>;
pub type SourceMap = HashMap<PathBuf, FileSourceMap>;

We should replace this with the source maps that are now being produced by the compiler since #5521

#[derive(Debug, Clone, Default, Serialize, Deserialize)]
pub struct SourceMap {
    /// Paths of dependencies in the `~/.forc` directory, with the prefix stripped.
    /// This makes inverse source mapping work on any machine with deps downloaded.
    pub dependency_paths: Vec<PathBuf>,
    /// Paths to source code files, defined separately to avoid repetition.
    pub paths: Vec<PathBuf>,
    /// Mapping from opcode index to source location
    // count of instructions, multiply the opcode by 4 to get the byte offset
    pub map: BTreeMap<usize, SourceMapSpan>,
}