Introduce a result interface to allow extraction of diagnostics

[ruediste]

I need access to the individual diagnostics messages. Unfortunately, the only implemented behaviour was to throw an exception when on compile errors/warnings. What do you think?

[codecov-io]

Codecov Report

Merging #19 into master will decrease coverage by 0.04%. The diff coverage is 93.93%.

@@           Coverage Diff           @@
##           master   #19      +/-   ##
=======================================
- Coverage   86.04%   86%   -0.05%     
=======================================
  Files           6     6              
  Lines          86   100      +14     
  Branches        8    10       +2     
=======================================
+ Hits           74    86      +12     
- Misses         10    12       +2     
  Partials        2     2

Impacted Files	Coverage Δ
...n/java/org/mdkt/compiler/InMemoryJavaCompiler.java	85.71% <93.93%> (ø)	:arrow_up:

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