Implement more extensions to access android resources

[MarinaShaposhnikova]

Steps to reproduce:

1. Open ContextUtils.kt
2. Observe only 3 ext methods
3. Call Vacxe

Expected Results:

• What did you expect to happen?

I would like to have more extension to use because right now the codebase is not consistent.
We use the ext method getResourceString to access the string, but if we would like to access the string with args or a quantity string, we have to either have our own ext or invoke InstrumentationRegistry directly.

Relevant Code:

fun getQuantityString(@PluralsRes resId: Int, quantity: Int) = 
 InstrumentationRegistry.getInstrumentation().targetContext.resources.getQuantityString(
              resId,
              quantity,
          )

fun getResourceString(@StringRes resId: Int, vararg args: Any) = 
  InstrumentationRegistry.getInstrumentation().targetContext.resources.getString(
              resId,
              args,
          ) 

PR with reproduction on Sample App

• See: #