feat: Simple Fees: use new extras for topic custom fees

[joshmarinacci]

Description:

To support custom fees properly we need custom extras in the Simple Fees fee schedule. This PR:

• adds two new extras to the Simple Fees fee schedule protobuf.
• updates ConsensusCreateTopicFeeCalculator and ConsensusSubmitMessageFeeCalculator to use these new extras.
• sets prices on the extras in the fee schedule to match the published prices.
• adds two unit tests for custom fees to ConsensusServiceSimpleFeesSuite.

It also exposes readableStore in CalculatorState.

Related issue(s):

partially Fixes ##22171

Notes for reviewer:

Checklist

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

[lfdt-bot]

✅ Snyk checks have passed. No issues have been found so far.

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[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.02% (target: -1.00%)	✅ 37.50%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (063ba56)	104800	78410	74.82%
Head commit (d6c70ec)	104816 (+16)	78402 (-8)	74.80% (-0.02%)

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 (#22252)	8	3	37.50%

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

❌ Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...alculator/ConsensusSubmitMessageFeeCalculator.java	20.00%	4 Missing ⚠️
.../calculator/ConsensusCreateTopicFeeCalculator.java	0.00%	1 Missing and 2 partials ⚠️

@@             Coverage Diff              @@
##               main   #22252      +/-   ##
============================================
- Coverage     70.97%   70.94%   -0.03%     
+ Complexity    24616    24596      -20     
============================================
  Files          2698     2694       -4     
  Lines        104935   104913      -22     
  Branches      11029    11032       +3     
============================================
- Hits          74478    74433      -45     
- Misses        26441    26465      +24     
+ Partials       4016     4015       -1     

Files with missing lines	Coverage Δ	Complexity Δ
.../calculator/ConsensusCreateTopicFeeCalculator.java	50.00% <0.00%> (-10.00%)	3.00 <0.00> (ø)
...alculator/ConsensusSubmitMessageFeeCalculator.java	64.28% <20.00%> (-35.72%)	3.00 <0.00> (ø)

... and 20 files with indirect coverage changes

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