[css modules] Add global style modules

[vctt94]

In decrediton we may have some styles which are the same for the whole application, for example, the class is-row which is used to describe a flex row around the code.

Rigth now if we need it with modules, we are adding isRow to many css modules, with the same code, which could be avoided if we have a shared global css modules, which are the same for many applications places.

[amass01]

Make total sense, we need a main.css to replace main.less which can be used as plain classes without module hashing, and as @vctt94 mentioned can be used globally from any part of the app using string classes.

Usage would look something like:

className={classNames(styles.somthing, "classFromMainCss")}

[amass01]

#3324 introduces main.css file for global styling.