perf: Introduce SourceSlice

[kdy1]

Description:

SourceSlice is sort of &' input str that is owned. It works by using Lrc<str>, which is the type of SourceFile.src. This type is used to avoid (enormous amount of) allocations for raw fields. With this PR, raw fields are now SourceSlice, which does not allocate.

BREAKING CHANGE:

• swc_common::SourceFile.src is now Lrc<str> instead of Lrc<String>.
• swc_common::input::StringInput now takes &'a Lrc<str> instead of &'a str.

[kdy1]

I'll postpone this PR. Performance difference is about ~2%

[kdy1]

With boxing, the performance is much better.
The problem is now rkyv implementations for Wasm plugins...

Gnuplot not found, using plotters backend
es/lexer/cal-com        time:   [5.8715 ms 5.8856 ms 5.9024 ms]
                        change: [-4.0248% -3.7259% -3.4050%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 6 outliers among 100 measurements (6.00%)
  1 (1.00%) high mild
  5 (5.00%) high severe

     Running benches/parser.rs (/Users/kdy1/projects/s/perf/target/release/deps/parser-b0b086eaa04716f6)
Gnuplot not found, using plotters backend
es/parser/cal-com       time:   [14.626 ms 14.713 ms 14.815 ms]
                        change: [-3.0856% -2.3994% -1.6524%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 16 outliers among 100 measurements (16.00%)
  7 (7.00%) high mild
  9 (9.00%) high severe