outsourced product regex patterns into new dedicated module 'patterns'

[johntruckenbrodt]

The classes for reading SAR data in pyroSAR.drivers contain regular expressions for identifying product file/folder names. Furthermore, the file _dev_config.py contained a pattern for identifying files with pyroSAR's unified naming scheme.
These patterns have now been outsourced into a new module pyroSAR.patterns for convenient reuse in other tools.