* Adding Add/Values fn for transport and metadata layers, fixed tests and included tests to new functionaltieis, updated metadata middleware to append instead of hard set of key-values
* Remove useless function
* Linit fix
---------
Co-authored-by: Ibrahim Barghouthi <ibrahim.barghouthi@cenomi.com>
* test:supplement metadata set test
* test:supplement metadata range test
* test:supplement metadata append to client context test
* test:fix linter error
* text:fix metadate range test