[Feature] Read replacement strings from file

[richardrigutins]

Add the possibility of reading multiple strings to substitute and their replacements from a local file contained in the repository.

For instance, this feature could be useful if:

• You need to replace many strings; by reading them from a file, you would need to call this action only once.
• You have different values to replace based on the application environment or other conditions; this way, you could create separate files containing the replacements for a specific environment.

This feature would require a new input parameter (e.g. replacementsFilePath).
Users of the action would need to use either this parameter or the usual replacement-text and search-text (but not both options at the same time).