Send pre-defined payload when item's selection/expansion is toggled

[DevAhamed]

When the item's selection/expansion is changed the 'notifyItemChanged' method is called. Previously the notify method was called with null payload. With this commit, now the notify method will be called with constant string as payload.

[codecov-io]

Codecov Report

Merging #81 into 2.x will not change coverage. The diff coverage is 75%.

@@          Coverage Diff          @@
##             2.x     #81   +/-   ##
=====================================
  Coverage   73.4%   73.4%           
=====================================
  Files         20      20           
  Lines       1132    1132           
  Branches     169     169           
=====================================
  Hits         831     831           
  Misses       205     205           
  Partials      96      96

Impacted Files	Coverage Δ
...rc/main/java/mva2/adapter/decorator/Decorator.java	94.44% <ø> (ø)	:arrow_up:
...adapter/src/main/java/mva2/adapter/ItemBinder.java	47.61% <ø> (ø)	:arrow_up:
...pter/src/main/java/mva2/adapter/NestedSection.java	73.75% <ø> (ø)	:arrow_up:
.../java/mva2/adapter/util/InfiniteLoadingHelper.java	77.41% <ø> (ø)	:arrow_up:
...ter/src/main/java/mva2/adapter/ItemViewHolder.java	78.26% <ø> (ø)	:arrow_up:
...ew-adapter/src/main/java/mva2/adapter/Section.java	69.31% <ø> (ø)	:arrow_up:
...dapter/src/main/java/mva2/adapter/ListSection.java	87.7% <100%> (ø)	:arrow_up:
...pter/src/main/java/mva2/adapter/HeaderSection.java	55.1% <50%> (ø)	:arrow_up:
...dapter/src/main/java/mva2/adapter/ItemSection.java	56.71% <50%> (ø)	:arrow_up:

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