Reorganize the catch-all `others/` and `misc/` packages into thematic packages

[DenizAltunkapan]

Description

The others/ (35 files) and misc/ (15 files) packages have grown into dumping grounds: they hold unrelated algorithms that already have a natural home elsewhere in the project. This makes algorithms hard to discover and encourages duplicates (e.g. a graph algorithm landing in others/ instead of next to the other graph algorithms).

Examples of misplaced files

File	Better home
others/Dijkstra.java, others/PageRank.java	datastructures/graphs/
others/Huffman.java	compression/
others/CRC16.java, others/CRC32.java, others/CRCAlgorithm.java	a dedicated checksums/ package
misc/TwoSumProblem.java, misc/ThreeSumProblem.java, others/TwoPointers.java	a shared two-pointer/array-problems package

Proposed change

Move the files into the packages they belong to (updating package declarations, imports and test locations) and, ideally, retire others/ and misc/ entirely so there is no longer an "everything else" bucket.

This is purely a reorganization — no algorithm behavior changes.