Add placement options for the exporter to the chart

[nabokihms]

These options help to place pods of the exporter to desirable nodes.

• Revision history
• Node selector
• Tolerations
• Topology spread constraints
• Affinity
• PDB

Attention! Replicas count and resources are now under the global values key.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (24928d4) 20.00% compared to head (e5a44b1) 20.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #95 +/- ## ======================================= Coverage 20.00% 20.00% ======================================= Files 4 4 Lines 570 570 ======================================= Hits 114 114 Misses 448 448 Partials 8 8 ```

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