Enable regexes and functions in link patterns

[yoave23]

Which problem is this PR solving?

Unblocked by JSON config support from #123

Short description of the changes

Allow matching link patterns with regular expressions or functions

example with regex, this will apply the pattern all tags:

{
  type: 'tags',
  text: 'hello world',
  key: /./,
  url: 'https://github.com/jaegertracing',
}

example for function config:

{
  type: 'tags',
  text: 'hello world',
  key: (key: string) => key.startsWith('comp'),
  url: 'https://github.com/jaegertracing',
}

[codecov]

Codecov Report

Merging #817 (2a139dc) into master (a3addbe) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #817      +/-   ##
==========================================
- Coverage   95.22%   95.19%   -0.03%     
==========================================
  Files         231      231              
  Lines        7097     7103       +6     
  Branches     1706     1709       +3     
==========================================
+ Hits         6758     6762       +4     
- Misses        333      335       +2     
  Partials        6        6              

Impacted Files	Coverage Δ
packages/jaeger-ui/src/model/link-patterns.tsx	94.89% <100.00%> (+0.33%)	⬆️
...mponents/TracePage/TraceStatistics/tableValues.tsx	96.87% <0.00%> (-0.70%)	⬇️

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[yurishkuro]

Please add documentation somewhere.

FWIW, I see that the README has a UI Configuration section that simply points to the website, I wonder if it would've been better to do the opposite, i.e. keep docs in this repo (e.g. plexus plugin has an extensive README, as well as tracking API) and point the docs here.

[yoave23]

Please add documentation somewhere.

can it wait till I submit a PR for #729? should be ready by the end of the week