feat: Combine transaction.proto and transaction_body.proto into a single file

[kimbor]

Description:
Implement option 2 from issue #17360

Related issue(s):

Fixes #17360

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.06% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (46446f1)	96454	69071	71.61%
Head commit (7c836a9)	96454 (+0)	69129 (+58)	71.67% (+0.06%)

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 (#17361)	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%

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.79%. Comparing base (46446f1) to head (7c836a9).

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17361      +/-   ##
============================================
+ Coverage     67.73%   67.79%   +0.06%     
- Complexity    22199    22221      +22     
============================================
  Files          2594     2594              
  Lines         96671    96671              
  Branches      10081    10081              
============================================
+ Hits          65477    65539      +62     
+ Misses        27448    27390      -58     
+ Partials       3746     3742       -4     

Files with missing lines	Coverage Δ
.../src/main/java/com/hedera/hapi/util/HapiUtils.java	61.71% <ø> (ø)
...m/hedera/hapi/util/UnknownHederaFunctionality.java	100.00% <ø> (ø)
...edera/node/app/hapi/utils/CommonPbjConverters.java	68.44% <ø> (ø)
...e/addressbook/impl/handlers/NodeCreateHandler.java	98.03% <ø> (ø)
...e/addressbook/impl/handlers/NodeDeleteHandler.java	96.96% <ø> (ø)
...e/addressbook/impl/handlers/NodeUpdateHandler.java	95.94% <ø> (ø)
.../main/java/com/hedera/node/app/spi/AppContext.java	33.33% <ø> (ø)
.../hedera/node/app/spi/authorization/Authorizer.java	100.00% <ø> (ø)
...hedera/node/app/spi/workflows/DispatchOptions.java	100.00% <ø> (ø)
...m/hedera/node/app/spi/workflows/HandleContext.java	75.00% <ø> (ø)
... and 164 more

... and 16 files with indirect coverage changes

[david-bakin-sl]

LGTM for hedera-smart-contract-service-impl