refactor: gossip module names and extract FallenBehindManager to gossip module

[mustafauzunn]

Description:

1. Rename gossip modules to org.hiero.consensus.gossip...
2. Move FallenBehindManager to gossip module

Related issue(s):

Fixes #16105

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.89%. Comparing base (f1c9cf6) to head (0a0c578).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop   #16113      +/-   ##
=============================================
- Coverage      57.89%   57.89%   -0.01%     
- Complexity     19676    19677       +1     
=============================================
  Files           2719     2719              
  Lines          99447    99447              
  Branches       10285    10285              
=============================================
- Hits           57576    57572       -4     
- Misses         38278    38288      +10     
+ Partials        3593     3587       -6     

Files with missing lines	Coverage Δ
...irlds/platform/gossip/FallenBehindManagerImpl.java	78.04% <ø> (ø)
...rm/gossip/shadowgraph/ShadowgraphSynchronizer.java	0.81% <ø> (ø)
.../swirlds/platform/gossip/sync/SyncManagerImpl.java	83.33% <ø> (ø)
...ds/platform/gossip/sync/protocol/SyncProtocol.java	95.00% <ø> (ø)
...orm/network/protocol/ReconnectProtocolFactory.java	100.00% <ø> (ø)
...platform/network/protocol/SyncProtocolFactory.java	100.00% <ø> (ø)
.../swirlds/platform/reconnect/ReconnectProtocol.java	81.63% <ø> (ø)

... and 7 files with indirect coverage changes

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.01% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (f1c9cf6)	99264	61032	61.48%
Head commit (0a0c578)	99264 (+0)	61022 (-10)	61.47% (-0.01%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#16113)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

See your quality gate settings    Change summary preferences

_{Codacy stopped sending the deprecated coverage status on June 5th, 2024. Learn more}

[litt3]

I approve of the changes generally, but I fear the file movement will still be in substantial conflict with this open PR

[anthony-swirldslabs]

I approve of the changes generally, but I fear the file movement will still be in substantial conflict with this open PR

Since we decided to split that huge PR into multiple smaller pieces, I think this is no longer a blocker.