Add a PodDisruptionBudget to gRPC and REST

[steven-sheehy]

Detailed description:

• Add a PodDisruptionBudget to gRPC chart
• Add a PodDisruptionBudget to REST chart
• Enable gRPC HPA with a min replicas of 2 for production
• Enable PodDisruptionBudget by default for production
• Fix PodDisruptionBudget not allowing percentage values

Which issue(s) this PR fixes:

Special notes for your reviewer:

Checklist

• Documentation added
• Tests updated

[codecov]

Codecov Report

Merging #2138 (6cf462f) into master (0000d7b) will increase coverage by 23.75%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master    #2138       +/-   ##
=============================================
+ Coverage     57.92%   81.68%   +23.75%     
- Complexity        0     2115     +2115     
=============================================
  Files            56      410      +354     
  Lines          2491    10871     +8380     
  Branches        325      899      +574     
=============================================
+ Hits           1443     8880     +7437     
- Misses          903     1681      +778     
- Partials        145      310      +165     

Impacted Files	Coverage Δ
...n/java/com/hedera/datagenerator/DataGenerator.java	0.00% <ø> (ø)
...dera/datagenerator/DataGeneratorConfiguration.java	0.00% <ø> (ø)
.../hedera/datagenerator/DataGeneratorProperties.java	0.00% <ø> (ø)
...agenerator/common/CryptoTransactionProperties.java	0.00% <ø> (ø)
...com/hedera/datagenerator/common/EntityManager.java	0.00% <ø> (ø)
...atagenerator/common/FileTransactionProperties.java	0.00% <ø> (ø)
...tagenerator/common/TopicTransactionProperties.java	0.00% <ø> (ø)
...era/datagenerator/common/TransactionGenerator.java	0.00% <ø> (ø)
...nerator/common/TransactionGeneratorProperties.java	0.00% <ø> (ø)
.../java/com/hedera/datagenerator/common/Utility.java	86.95% <ø> (ø)
... and 507 more

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[sonarcloud]

SonarCloud Quality Gate failed.

0 Bugs
0 Vulnerabilities
0 Security Hotspots
26 Code Smells

0.0% Coverage
5.1% Duplication

[Nana-EC]

LGTM

[xin-hedera]

LGTM