Fix consistent format for View command

[brianchoon]

Summary

Currently, the view command is implemented by typing the exact event name after the keyword. For example, one must type view NUS Student Life Fair 2024 to view the details of an event titled "NUS Student Life Fair 2024".

In line with the rest of our commands, we wish to refer to events by index, i.e. view 1 to view the event with ID 1.

This PR fixes this.

Issues Fixed

Fixes #171

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ogic/commands/event/commands/ViewEventCommand.java	75.00%	1 Missing and 1 partial ⚠️

Files with missing lines	Coverage Δ	Complexity Δ
...ic/parser/event/parser/ViewEventCommandParser.java	100.00% <100.00%> (ø)	3.00 <1.00> (ø)
...ogic/commands/event/commands/ViewEventCommand.java	78.94% <75.00%> (-21.06%)	6.00 <1.00> (-1.00)

... and 2 files with indirect coverage changes

[cshao02]

LGTM!