BE: FE: Topics: Allow custom topic params upon creation

[Nilumilak]

Resolve #84

• Breaking change? (if so, please describe the impact and migration path for existing application instances)

What changes did you make? (Give an overview)

Is there anything you'd like reviewers to focus on?

How Has This Been Tested? (put an "x" (case-sensitive!) next to an item)

• No need to
• Manually (please, describe, if necessary)
• Unit checks
• Integration checks
• Covered by existing automation

Checklist (put an "x" (case-sensitive!) next to all the items, otherwise the build will fail)

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (e.g. ENVIRONMENT VARIABLES)
• My changes generate no new warnings (e.g. Sonar is happy)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[VladSenyuta]

@Haarolean hey, I've faced failed brokersConfigEditCheck at this PR
and while investigation really reproduced it locally. it's not because of test :)

Brokers -> open one -> Configs tab -> search for 'log.cleaner.min.compaction.lag.ms'
Edit-> set new value -> Save -> Confirm

I really saw twice when after setting new value there's displayed old one