Improve inject_global_rule to allow structured data

[jeparlefrancais]

Closes #126

• Add support for composed data-structures like arrays or objects for the value property. That means that you can now inject tables into a global value

• Add a new property to read JSON data from an environment variable (using env_json instead of env)

• Add a new property to provide a default value when using a undefined environment variable (default_value)

• add entry to the changelog

[github-actions]

Coverage after merging improve-inject-global-rule into main will be

86.88%

Coverage Report for Changed Files

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src/rules
inject_value.rs	86.73%	100%	93.55%	86.04%	180, 188, 194–205, 207–216, 218, 221–227, 233, 239–241, 74, 78–79
mod.rs	90.27%	100%	83.78%	91.06%	136–138, 157–159, 174, 195–197, 199, 245–247, 358, 398–400, 427, 434–437, 451
rule_property.rs	92.52%	100%	96%	91.88%	107, 113, 157–162, 164–167, 171–172, 38, 46, 57, 73, 91, 97