feat: Add Free Stuff Filter

[RotBolt]

Fixes #1609

Changes:

• Add Filter Search fragment (Currently Added Free stuff filter only - working)
• Display Free events only after applying filter

Screenshots for the change:

• Notice PGConf APAC its PAID event. After applying filter. Its not shown in the list

[RotBolt]

@aggarwalpulkit596 Please review this

[RotBolt]

@iamareebjamal EventBrite has also put option to change location , date and type. Should I also put these filters ? Currently Put Free event filter

[iamareebjamal]

In future PRs

[aggarwalpulkit596]

use linear layout instead of constraint layout for better performance

[RotBolt]

ConstraintLayout is to optimize and flatten the view hierarchy of your layouts by applying some rules to each view to avoid nesting. Currently Only one filter is added , but in future other filter would also be added, so for then this would be better

[aggarwalpulkit596]

This layout can be easily achieved using linear layout and secondly it flatten the view heirarchy but at what cost and this is already single activity app and using constraint layout makes it even more expensive and time consuming so i would highly recommend using linear layout for such simple layouts
References
https://android.jlelse.eu/constraint-layout-performance-870e5f238100

[aggarwalpulkit596]

And Linear layout slows down only if there is nesting level of >3 and in this case it wouldn't be happening ever

[RotBolt]

Cool! thanks for the link. I would make changes surely.