Added Search funcionality to GET /offers

[imnotteixeira]

Closes #55
Closes #11

Added search functionality (at least an initial version)

It supports:

• Full-text search (via the value param which is open text) (uses the title, jobType, location, fields and technologies for the search, after Add owner auto-fill when creating offers #94, we can implement company name search as well)
• Results filtering on the following fields:
  • jobType
  • jobMinDuration + jobMaxDuration
  • fields
  • technologies
  • After Add owner auto-fill when creating offers #94, we can support company name filtering as well, I'm not sure we want to, though

[miguelpduarte]

Given that #94 was already merged, does this include company name in the FTS?

[imnotteixeira]

Given that #94 was already merged, does this include company name in the FTS?

Yes, check the latest commit

[miguelpduarte]

Very small changes, almost good to go. The end-to-end tests look pretty cool btw! 😎