Use BleuScore TypeDict for BLEU score

[bact]

What do these changes do

Introduce BleuScore class for BLEU score

class BleuScore(TypedDict):
    """BLEU score"""

    bleu: float  # BLEU score as a percentage (0.0 to 100.0)
    precisions: list[float]
    bp: float
    length_ratio: float
    hyp_length: int
    ref_length: int

What was wrong

blue_score function returns untyped dict.

Your checklist for this pull request

• Passed code styles and structures
• Passed code linting checks and unit test

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[coveralls]

coverage: 66.598% (+0.02%) from 66.574%
when pulling fc118dc on bact:bleuscore-type
into 1110c48 on PyThaiNLP:dev.