Allow updating node openness programmatically + global refactoring and dependecy updates

[Lodin]

Resolves #21.

This PR contains the following changes.

opennessState

This PR introduces an ability to change the node openness state programmatically as requested in #21. To do it, you have to call recomputeTree method with a new parameter opennessState. You have to specify an object that contains IDs of nodes you want to toggle as keys and their new openness state as values.

treeRef.current.recomputeTree({
  opennessState: {
    foo: true,
    bar: false,
  }
});

NOTE: If you specify both useDefaultOpenness and opennessState, opennessState will be overridden by useDefaultOpenness results.

Breaking Changes

Along with the new feature, this PR specifies the breaking changes in Typescript types because of the global refactoring that reduces the size of the package significantly.

[codecov]

Codecov Report

Merging #23 into master will decrease coverage by 1.94%.
The diff coverage is 97.93%.

@@            Coverage Diff             @@
##           master      #23      +/-   ##
==========================================
- Coverage   99.29%   97.34%   -1.95%     
==========================================
  Files           3        4       +1     
  Lines         141      113      -28     
  Branches       34       23      -11     
==========================================
- Hits          140      110      -30     
- Misses          1        3       +2     

Impacted Files	Coverage Δ
src/Tree.tsx	96.07% <96.07%> (ø)
src/FixedSizeTree.tsx	100.00% <100.00%> (ø)
src/VariableSizeTree.tsx	96.96% <100.00%> (-1.80%)	⬇️
src/utils.ts	100.00% <100.00%> (ø)

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