[NEW] implemented using slots, so it takes less memory
    than the dict it replaces. It supports dictionary
    style indexing, so old code will work. It also
    aliases certain old keys.

[CHANGED] updated return type hints to reflect the new class

[CHANGED] updated tests to reflect these changes

[CHANGED] this frees parser from having to always start at
    the top of a file to figure out the format version.

[CHANGED] previously, this was reversed if a feature was on the minus
    strand.

[CHANGED] this was a private method on GffAnnotationDb but has been
    made a function to facilitate chunked reading of Gff files.

[CHANGED] iter_line_blocks() now supports num_lines=None, which results
    in all lines being returned.

[CHANGED] just calls bound sqlitedb's close method

[CHANGED] incomplete records in a GFF database can be updated

…tations

[CHANGED] we achieve a ~75% reduction in RAM for creating a GffAnnotationDb
    for the human genome by combining iter_line_blocks(), which uses
    iter_splitlines(), merged_gff_records() and
    GffAnnotationDb.update_record_spans(). The
    load_annotations(lines_per_block=500_000) argument controls how many lines
    are read before the insert is done. We track all record name's that have
    been inserted and update their existing spans.

[NEW] builds indexes for standard columns, biotype, seqid, start, etc..

[NEW] thanks to comment in code review by khiron, added
    # codacy:ignore[sql-injection] - limited SQL injection exposure
    to silence this codacy warning. As this is purely in a test,
    it doesn't seem to have much risk.

[CHANGED] seems comment ws incorrect

[CHANGED] this is from the bandit tool, which indicates B608
    as the error for hardcoded_sql_expressions

Improve performance of annotation db creation, querying

NEW: abstract base class for views, fixes #1865

[NEW] MolType.is_compatible_alphabet() checks that the characters
     in an alphabet match those in one of the members of the
     MolType.alphabets. The argument strict=False (the default)
     means the exact ordering of elements must match.

[NEW] AlphabetGroup.iter_alphabets() yields individual alphabets
     from the group.

This reverts commit d384bca, reversing
changes made to 3a72310.

Revert "Merge branch 'seq-collections-refactor' into develop"

DOC: Add IndelMap param docstring