Make `HarReader` and `HarWriter` symmetric

[valfirst]

New methods:

• HarReader#readFromInputStream(java.io.InputStream)
• HarReader#readFromInputStream(java.io.InputStream, HarReaderMode)
• HarReader#readFromBytes(byte[])
• HarReader#readFromBytes(byte[], HarReaderMode)
• HarWriter#writeAsString()

[codecov[bot]]

Codecov Report

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

Project coverage is 79.50%. Comparing base (27440b5) to head (45b6eed).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #181 +/- ## ============================================ + Coverage 78.92% 79.50% +0.57% - Complexity 394 402 +8 ============================================ Files 27 27 Lines 726 727 +1 Branches 131 131 ============================================ + Hits 573 578 +5 + Misses 153 149 -4 ```

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