AST & Parser

[JarvisCraft]

Description

This PR implements:

• Abstract Syntax Tree (AST) for Java Language as javac-rs-ast crate
• Java source code parser as javac-rs-parser crate

Reasoning

The reason for both projects to be implemented via one single PR is that parser is aimed at producing valid AST while the latter's implementation design depends on the former.

Aims

Current aim is to implement the latest specification (i.e. Java SE 15); however, it may happen so that initially only LTS specification (Java SE 8 or Java SE 11) will be fulfilled.

[pull-assistant]

Best reviewed: commit by commit

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Optimal code review plan (3 warnings, 2 commits squashed)

     dep: make parser depend on AST

     feat(parser): implement parsing of integral types

test(parser): cover `int_number` rule

javac-rs-parser/src/parser.rs 59% changes removed in refactor(parser): pa...

     refactor(parser): move similar number sub-rules to separate rules

     refactor(parser): remove redundant imports

refactor(parser): ma... ... refactor(parser): pa...

Squashed 2 commits:

• refactor(parser): make numeric parsing a bit more flexible

• refactor(parser): parse numbers to Option's

     fix(parser): allow upper-case integer prefixes

     feat(parser): implement rule for double numbers

feat(parser): implement rule for float numbers

javac-rs-parser/src/parser.rs 52% changes removed in refactor(parser): mo...

fix(parser): long number parsing

javac-rs-parser/src/parser.rs 50% changes removed in fix(parser): floatin...

     fix(parser): floating-point number parsing

     refactor(parser): move similar floating point number sub-rules to sepa...

     chore(CI): add Travis config

     Merge branch 'development' into ast-parsing

     feat(AST): add basic AST entries and type definitions

     style(AST): add blank line to end of ast.rs

     feat(AST): add missing literal types

     fix(AST): set correct Rust type for Java's long

     fix(AST): make Java type definitions public

     feat(parser): add rules for parsing literals

     feat(parser): implement rules for chars

     style(parser): resolve rustfmt issue with method chaining in parser.rs

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