tidy: enable performance checks

[Riolku]

With the exception of performance-no-int-to-ptr, this change enables clang tidy's performance-based lints.

The changes made are as follows, in no particular order.

• Avoid std::endl. std::endl is confusing because it also flushes the buffer, which is often undesirable. Instead, we should just use a newline character.
• When possible, declare variables as const T& instead of T, since it avoids a copy.
• When possible, use std::move to avoid a copy. However, if the type is trivially copyable, std::move does nothing and hence should be removed. Furthermore, if the variable to be moved is constant, std::move simply copies, and so std::move is confusing and should be removed. Finally, if the variable is moved, but the function parameter type is const T&, then a move is unnecessary, and again, it should be removed.
• When using push_back in a loop, we should reserve up front for better performance.
• When concatenating strings, either we should std::move() the strings, or use string::append. Otherwise, we pay the price of creating temporary strings, instead of just pushing to a single string.
• Trivial destructors should be declared with = default to allow more aggressive compiler optimizations.

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (e216c0c) 91.56% compared to head (fc7c404) 91.57%.

Files	Patch %	Lines
...operator/persistent/reader/parquet/column_reader.h	50.00%	1 Missing ⚠️
src/processor/operator/order_by/top_k.cpp	0.00%	1 Missing ⚠️
src/processor/result/flat_tuple.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2505   +/-   ##
=======================================
  Coverage   91.56%   91.57%           
=======================================
  Files        1026     1026           
  Lines       37909    37945   +36     
=======================================
+ Hits        34712    34747   +35     
- Misses       3197     3198    +1     

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