Verbose errors during interpretation

[namnc]

Error is very generic right now it is not super helpful, can we improve the information display upon error?

[namnc]

We just need very basic information for 1st release.

[namnc]

@curryrasul I think what this needs to handle are:

pub enum RuntimeError {
#[error("Access Error")]
AccessError,
#[error("Error retrieving context")]
ContextRetrievalError,
#[error("Empty context stack")]
EmptyContextStack,
#[error("Index out of bounds")]
IndexOutOfBounds,
#[error("Item already declared")]
ItemAlreadyDeclared,
#[error("Item not declared: {0}")]
ItemNotDeclared(String),
#[error("No context to inherit from")]
NoContextToInheritFrom,
#[error("Data Item content is not a single value")]
NotAValue,
#[error("Unsupported data type")]
UnsupportedDataType,
}

[namnc]

In particular I usually ran into Error: RuntimeError(IndexOutOfBounds) and not able to tell which index access cause this and have to do debugging ...