Rename com.hedera.mirror to com.hedera.mirror.importer

[steven-sheehy]

Detailed description:
Rename com.hedera.mirror to com.hedera.mirror.importer

Which issue(s) this PR fixes:
Related to #359

Special notes for your reviewer:

Checklist

• Documentation added
• Tests updated

[codecov]

Codecov Report

Merging #402 into master will decrease coverage by 0.02%.
The diff coverage is 52.57%.

@@            Coverage Diff             @@
##           master     #402      +/-   ##
==========================================
- Coverage   57.67%   57.65%   -0.03%     
==========================================
  Files          56       56              
  Lines        2474     2477       +3     
  Branches      323      323              
==========================================
+ Hits         1427     1428       +1     
- Misses        900      902       +2     
  Partials      147      147

Impacted Files	Coverage Δ
.../com/hedera/mirror/importer/domain/EntityType.java	33.33% <ø> (ø)
.../com/hedera/mirror/importer/domain/StreamType.java	100% <ø> (ø)
.../downloader/balance/AccountBalancesDownloader.java	80% <ø> (ø)
...com/hedera/mirror/importer/domain/Transaction.java	86.66% <ø> (ø)
...com/hedera/mirror/importer/parser/FileWatcher.java	14.7% <ø> (ø)
...hedera/mirror/importer/domain/TransactionType.java	33.33% <ø> (ø)
.../hedera/mirror/importer/domain/CryptoTransfer.java	80% <ø> (ø)
...er/downloader/event/EventStreamFileDownloader.java	33.33% <ø> (ø)
...a/mirror/importer/parser/balance/NumberedLine.java	75% <ø> (ø)
.../hedera/mirror/importer/MirrorNodeApplication.java	33.33% <ø> (ø)
... and 46 more

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[apeksharma]

why does this have so many non-import related changes - mainly removal of 'final' keyword?

[steven-sheehy]

I have the save actions plugin installed in Intellij (you should too) and it automatically formatted the code when updating the package.