Content from [1.2.beta-0](https://github.com/LinuxForHealth/CsvToFHIR/releases/tag/v1.2b0) and [1.2.beta-1](https://github.com/LinuxForHealth/CsvToFHIR/releases/tag/v1.2b1) including:
**Features:**
Add a new task for validating a column value using regex (52)
Add a new task for joining original dataframe with auxiliary data (49)
Enhance data contract model to simplify large data contracts (47)
Added support for 'skiprows' pandas parameter (32)
**Build / Development improvements:**
Add Jupyter Notebooks As An Optional Development Dependency (43)
Enabled codeql scanning (45, 44)
**Bugs Fixed:**
Basic resource fix for identifier (41)