Provide rand function for TensorValues

[eschnett]

No description provided.

[codecov-io]

Codecov Report

Merging #530 (90b21de) into master (5d7252b) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #530      +/-   ##
==========================================
+ Coverage   86.14%   86.18%   +0.03%     
==========================================
  Files         145      145              
  Lines       11327    11348      +21     
==========================================
+ Hits         9758     9780      +22     
+ Misses       1569     1568       -1     

Impacted Files	Coverage Δ
src/TensorValues/TensorValues.jl	100.00% <ø> (ø)
src/TensorValues/SymFourthOrderTensorValueTypes.jl	77.35% <100.00%> (+2.35%)	⬆️
src/TensorValues/SymTensorValueTypes.jl	66.66% <100.00%> (+2.28%)	⬆️
src/TensorValues/TensorValueTypes.jl	80.00% <100.00%> (+1.42%)	⬆️
src/TensorValues/ThirdOrderTensorValueTypes.jl	54.38% <100.00%> (+6.30%)	⬆️
src/TensorValues/VectorValueTypes.jl	80.43% <100.00%> (+0.43%)	⬆️

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[fverdugo]

Hi @eschnett. This is very usefull. Thanks!

Can you add a small comment about the new functionality in NEWS.md ? In the "Unreleased" section, "Added" sub-section. E.g.:

# Changelog
All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

## Undeleased

### Added
- `rand` function for `MultiValue` objects.

[eschnett]

Done.