Add PHI codes to 'spring-fat' integration test

[volodya-lombrozo]

We need to add PHI printing to the 'spring-fat' integration test. We can print PHI expressions from EO files using the xmir-to-phi goal of the eo-maven-plugin:

<plugin>
  <groupId>org.eolang</groupId>
  <artifactId>eo-maven-plugin</artifactId>
  <version>0.36.0</version>
  <executions>
    <execution>
      <id>convert-xmir-to-phi</id>
      <phase>process-classes</phase>
      <goals>
        <goal>xmir-to-phi</goal>
      </goals>
      <configuration>
        <phiInputDir>${project.build.directory}/generated-sources/jeo-xmir</phiInputDir>
        <phiOutputDir>${project.build.directory}/generated-sources/jeo-phi</phiOutputDir>
      </configuration>
    </execution>
  </executions>
</plugin>

[0pdd]

@volodya-lombrozo 3 puzzles #245, #246, #247 are still not solved.

[0pdd]

@volodya-lombrozo 5 puzzles #245, #246, #247, #255, #256 are still not solved.

[0pdd]

@volodya-lombrozo 6 puzzles #245, #246, #247, #255, #256, #268 are still not solved.

[0pdd]

@volodya-lombrozo 5 puzzles #245, #246, #247, #255, #268 are still not solved; solved: #256.

[0pdd]

@volodya-lombrozo 4 puzzles #245, #246, #247, #255 are still not solved; solved: #256, #268.

[0pdd]

@volodya-lombrozo 3 puzzles #245, #246, #255 are still not solved; solved: #247, #256, #268.

[0pdd]

@volodya-lombrozo 2 puzzles #245, #246 are still not solved; solved: #247, #255, #256, #268.