Implement priority long vector execution tests

[alsepkow]

Implement the high priority long vector exec tests as listed in this pr

• Initializing a vector with another.
• Multiply all components of a vector with a scalar value
• Add all components of a vector with a scalar value
• Clamp all components of a vector to the range [c, t]
• Component wise minimum between 2 vectors
• Component wise maximum between 2 vectors
• Component wise multiply between 2 vectors
• Component wise add between 2 vectors
• Subscript access, vec[i] = c

[alsepkow]

Work completed in staging branch.