Add sync_native instruction

[pyz4]

Add instruction for syncing a token account's data.amount field with the account's lamport field for working with wrapped sol token accounts.

[codecov[bot]]

Codecov Report

Merging #376 (907f1a3) into master (c60f9ff) will increase coverage by 0.05%. The diff coverage is 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #376 +/- ## ========================================== + Coverage 89.93% 89.99% +0.05% ========================================== Files 28 28 Lines 2215 2228 +13 ========================================== + Hits 1992 2005 +13 Misses 223 223 ```

[michaelhly]

@pyz4 can you run make lint and fix all the lint errors?

[pyz4]

@michaelhly, done